react-select is a dependency (not devDependency) for installing this package

Using webpack, `npm i react-network-diagrams` gives me this.

```
ERROR in ./node_modules/react-network-diagrams/lib/components/MapEditor.js
Module not found: Error: Can't resolve 'react-select' in '/Users/xyz/project/node_modules/react-network-diagrams/lib/components'
@ ./node_modules/react-network-diagrams/lib/components/MapEditor.js 22:19-42
@ ./node_modules/react-network-diagrams/lib/index.js
@ ./project/js/components/Network.js
@ ./project/js/components/App.js
@ ./project/js/index.js
@ multi babel-polyfill ./project/js/index.js
```