Merge pull request #487 from netlify/docs/improve-releasing

Improve release docs

Author: ehmicky

CONTRIBUTING.md

@@ -3,13 +3,12 @@
 Contributions are always welcome, no matter how large or small. Before contributing,
 please read the [code of conduct](CODE_OF_CONDUCT.md).
 
-TODO...
-
 ## Releasing
 
-1. `npm version [major, minor, patch]`  Generate changelog, bump version, version commit + tag.
-2. `npm run release` Push version commit + tag, push latest CHANGELOG entry to GitHub release page.
-
+1. `npm version [major, minor, patch]`: generate changelog, bump version, version commit + tag.
+2. `npm run release`: push version commit + tag, push latest CHANGELOG entry to GitHub release page.
+3. Wait for Jenkins build to finish
+4. Create a PR in the [buildbot](https://github.com/netlify/buildbot) to bump [the version](https://github.com/netlify/buildbot/blob/a247edab7ead955cc27bb70ecc9f081e68f1aea6/script/docker-build.sh#L17) of the `build-image`.
 
 ## License