v1.1.0: Add removal_actions for DDEV v1.22.0

What's Changed

• README tune-up by @mattstein in #13
• Remove obsolete docker-compose version: 3.6 by @rfay in #14
• Add removal_action to remove settings.ddev.redis.php on add-on removal by @rfay in #15
• Update github test workflow to current by @rfay in #16

New Contributors

• @mattstein made their first contribution in #13

Full Changelog: v1.0.5...v1.1.0