Update the release checklist based on discussions.

Author: Mike Nikles

RELEASE.md

@@ -6,11 +6,10 @@
       Paste the contents of this checklist into this pull request.
 - [ ] Increment the version in `package.json`.
 - [ ] In the CHANGELOG.md file of this release branch, change the 'To be released' header to 'vX.Y.Z'.
-- [ ] Merge `release-vX.Y.Z` into `master` using the pull request (**don't delete the `release-vX.Y.Z` branch yet!!**).
-- [ ] [Publish to npm](https://docs.npmjs.com/cli/publish) from the release branch.
+- [ ] Merge `release-vX.Y.Z` into `master` using the pull request, then delete the release branch.
+- [ ] [Publish to npm](https://docs.npmjs.com/cli/publish) from the `master` branch.
 - [ ] Draft a new Github release with the following settings:
-      * Tag version: `X.Y.Z` @ `release-vX.Y.Z`
-      * Release title: `X.Y.Z - <island_name>`
+      * Tag version: `X.Y.Z` @ `master`
+      * Release title: `X.Y.Z`
       * Description: Use highlights from the CHANGELOG.md (only pick out the most significant changes)
-- [ ] Merge `release-vX.Y.Z` into `develop` (no need for review on PR, just merge).
-- [ ] Delete `release-vX.Y.Z` branch.
+- [ ] Merge `master` into `develop` (no need for review on PR, just merge).