README.md: Document how we version new rubocop releases

README.md

@@ -21,9 +21,16 @@ used in all Vox Pupuli gems.
 In your Gemfile, add the following:
 
 ```
-gem 'voxpupuli-rubocop', '~> 1.1'
+gem 'voxpupuli-rubocop', '~> 2.1.0'
 ```
 
+**We suggest to pin the minor version like above, because new minor versions will pull in newer rubocop versions**
+
+(A best practice, that we also follow in our Vox Pupuli Ruby Gems, is to pin
+like above and use dependabot. It will provide pull requests that allow
+newer minor versions. And in a CI pipeline you will see if the newer rubocop
+works without issues. That prevents your HEAD branch from breaking.)
+
 In your Rakefile, include our Rake task:
 
 ```