Update RELEASING.md

RELEASING.md

@@ -5,8 +5,8 @@ The following steps are required to make a release of Amber:
 
 1. check that all tests are green
 2. check that the examples are up-to-date
-3. check that `API-CHANGES.txt` is up-to-date
-4. check the `CHANGELOG` file and update the release notes
+3. check that `API-CHANGES.txt` is up-to-date; remove the 'work in progress' from version
+4. check the `CHANGELOG` file and update the release notes, check the milestone index in issues link
 5. log in to npm with write access for the Amber package
 6. execute `cli/support/release.sh`
 7. answer the question about the version number used for the release