Describe the release process

MAINTAINING.md

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+# Maintaining
+## Release Process
+Chart.js relies on [Travis CI](https://travis-ci.org/) to automate the library [releases](https://github.com/chartjs/Chart.js/releases).
+
+### Releasing a New Version
+
+1. draft release notes on [GitHub](https://github.com/chartjs/Chart.js/releases/new) for the upcoming tag
+1. update `master` `package.json` version using [semver](http://semver.org/) semantic
+1. merge `master` into the `release` branch
+1. follow the build process on [Travis CI](https://travis-ci.org/chartjs/Chart.js)
+
+> **Note:** if `master` is merged in `release` with a `package.json` version that already exists, the tag
+creation fails and the release process is aborted.
+
+### Automated Tasks
+Merging into the `release` branch kicks off the automated release process:
+
+* build of the `dist/*.js` files
+* `bower.json` is generated from `package.json`
+* `dist/*.js` and `bower.json` are added to a detached branch
+* a tag is created from the `package.json` version
+* tag (with dist files) is pushed to GitHub
+
+Creation of this tag triggers a new build:
+
+* `Chart.js.zip` package is generated, containing dist files and examples
+* `dist/*.js` and `Chart.js.zip` are attached to the GitHub release (downloads)
+* a new npm package is published on [npmjs](https://www.npmjs.com/package/chart.js)
+
+Finally, [cdnjs](https://cdnjs.com/libraries/Chart.js) is automatically updated from the npm release.
+
+### Further Reading
+
+* [Travis GitHub releases](/chartjs/Chart.js/pull/2555)
+* [Bower support and dist/* files](/chartjs/Chart.js/issues/3033)
+* [cdnjs npm auto update](/cdnjs/cdnjs/pull/8401)