Unmet peer dependencies

Hello, When I install the last `netlify-cms version, I have a lot of warnings:

```
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "immutable@^3.7.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "netlify-cms-lib-auth@2.0.0-alpha.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "netlify-cms-lib-util@2.0.0-alpha.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "netlify-cms-ui-default@2.0.0-alpha.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "prop-types@^15.6.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-bitbucket@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "immutable@^3.7.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "netlify-cms-lib-auth@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "netlify-cms-lib-util@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "prop-types@^15.6.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-git-gateway@2.0.5" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "netlify-cms-lib-auth@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "netlify-cms-lib-util@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "prop-types@^15.6.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-github@2.0.5" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "immutable@^3.7.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "netlify-cms-lib-auth@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "netlify-cms-lib-util@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "prop-types@^15.6.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-gitlab@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "immutable@^3.8.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "netlify-cms-lib-util@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "prop-types@^15.6.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-backend-test@2.0.5" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-boolean@2.0.3" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-boolean@2.0.3" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-boolean@2.0.3" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-boolean@2.0.3" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-date@2.0.4" has unmet peer dependency "moment@^2.11.2".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-date@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-date@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-date@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-file@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-file@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-file@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-file@2.0.4" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-image@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-image@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-image@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "immutable@^3.7.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-list@2.0.4" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "immutable@^3.7.6".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "lodash@^4.17.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "prop-types@^15.5.10".
10:47:35 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "react-emotion@^9.2.5".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown@2.0.5" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-number@2.0.3" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-number@2.0.3" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "immutable@^3.7.6".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "lodash@^4.17.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "react-emotion@^9.2.6".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-object@2.0.4" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "immutable@^3.7.6".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "lodash@^4.17.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "react-emotion@^9.2.5".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-relation@2.0.4" has unmet peer dependency "uuid@^3.1.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-select@2.0.3" has unmet peer dependency "immutable@^3.7.6".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-select@2.0.3" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-select@2.0.3" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-select@2.0.3" has unmet peer dependency "react-immutable-proptypes@^2.1.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-string@2.0.3" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-string@2.0.3" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-text@2.0.4" has unmet peer dependency "netlify-cms-ui-default@^2.0.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-text@2.0.4" has unmet peer dependency "prop-types@^15.5.10".
10:47:36 AM: warning "netlify-cms > netlify-cms-core > netlify-cms-lib-auth@2.0.3" has unmet peer dependency "lodash@^4.13.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-core > netlify-cms-lib-util@2.0.4" has unmet peer dependency "lodash@^4.13.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-core > netlify-cms-ui-default@2.0.4" has unmet peer dependency "lodash@^4.13.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-date > react-datetime@2.15.0" has unmet peer dependency "moment@>=2.16.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate@0.30.7" has unmet peer dependency "immutable@^3.8.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-edit-list@0.10.3" has unmet peer dependency "immutable@^3.8.2".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-edit-table@0.12.0" has unmet peer dependency "immutable@^3.8.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-edit-table@0.12.0" has incorrect peer dependency "slate@^0.27.2".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-plain-serializer@0.4.16" has unmet peer dependency "immutable@^3.8.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-plain-serializer@0.4.16" has incorrect peer dependency "slate@^0.31.8".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-react > slate-base64-serializer@0.2.43" has incorrect peer dependency "slate@>=0.32.0".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-react > slate-prop-types@0.4.41" has unmet peer dependency "immutable@>=3.8.1".
10:47:36 AM: warning "netlify-cms > netlify-cms-widget-markdown > slate-react > slate-prop-types@0.4.41" has incorrect peer dependency "slate@>=0.32.0".
```

**Describe the bug**
Too much warnigns during install

**To Reproduce**
`yarn add netlify-cms`

**Expected behavior**
No warning during install

**Applicable Versions:**
- Netlify CMS version: 2.0.10
- Node.JS version: 8.11.4
- Npm version: 6.4