Shout out new 3.x version in Wunder Slack

[hkirsman]

Steps to update:

1. composer require wunderio/code-quality:^3 --dev --with-all-dependencies
2. Suggested grumphp.yml changes

Todo

• Add Add git_commit_message.skip_on_merge_commit: true #98
• Verify this is still working and merge #72 Add tomasvotruba/cognitive-complexity. #95