Update release checklist to remove develop branch
[CI skip]
# Release Checklist
-* [ ] Get [master to the appropriate code release state](https://github.com/pylast/pylast/compare/master...develop?expand=1&title=Merge%20develop%20into%20master). [Travis CI](https://travis-ci.org/pylast/pylast) should be running cleanly for all merges to master.
+* [ ] Get master to the appropriate code release state. [Travis CI](https://travis-ci.org/pylast/pylast) should be running cleanly for all merges to master.
* [ ] Remove `.dev0` suffix from version in `pylast/__init__.py` and `setup.py` and commit:
```bash
git checkout master
@@ -33,9 +33,3 @@ git add pylast/__init__.py setup.py
git commit -m "Start new release cycle"
git push
```
-* [ ] Update develop branch from master:
-```bash
-git checkout develop
-git merge master --ff-only
-git push
-```
