Create instructions for releasing new versions

Author: homebysix

RELEASING.md

@@ -0,0 +1,11 @@
+# Releasing new versions of pre-commit-macadmin
+
+1. Update the versions in __README.md__ and __pre_commit_hooks/\_\_init\_\_.py__.
+
+1. Update the change log.
+
+1. Merge development branch to master.
+
+1. Create a GitHub release with version tag, prefixed with `v`. (For example: `v2.3.4`)
+
+1. Run `pre-commit autoupdate` on a test repo and confirm it updates to the new version.