Update RELEASE.md

Author: driesvints

RELEASE.md

@@ -1,3 +1,9 @@
 # Release Instructions
 
 Releases are managed by [@taylorotwell](https://github.com/taylorotwell), [@jessarcher](https://github.com/jessarcher), and [@timacdonald](https://github.com/timacdonald) for this repository.
+
+1. Update the version number in [package.json](./package.json) and commit it
+2. `npm install`
+3. `npm run build`
+4. `npm publish`
+5. Create a new GitHub release for this version with the release notes