Dependency deprecation warning: travis-deploy-once (npm)

On registry `https://registry.npmjs.org/`, the "latest" version (v5.0.11) of dependency `travis-deploy-once` has the following deprecation notice:

`We recommend to use Travis Build Stages instead`

Marking the latest version of an npm package as deprecated results in the entire package being considered deprecated, so contact the package author you think this is a mistake.

Affected package file(s): `package.json`

If you don't care about this, you can close this issue and not be warned about `travis-deploy-once`'s deprecation again. If you would like to completely disable all future deprecation warnings then add the following to your config:

```
"suppressNotifications": ["deprecationWarningIssues"]
```

Start by reading package.json and checking how travis-deploy-once is configured or used in this repository. Determine whether the deprecated dependency should be replaced or removed; done means the deprecation warning is addressed without breaking the Travis setup.

Written by the indexing model from the issue text.