Add note about circle.yml doing npm publish

Author: Jeremy Wiebe

RELEASE.md

@@ -3,3 +3,7 @@
 Use Slack to release new versions of the Mobify Code Style. 
 
 `@mobitron release mobify-code-style [minor|patch]`
+
+The release script will create the release and prep the npm package. Near the
+end it merges a release branch in `master` which kicks off `circle.yml`. The
+final npm publish step is done within the circle.yml file.