v1.6.0 - Support chirpstack v4

What's Changed

• Added a small section on tls in the installation guide by @fcv-iteratorIt in #42
• Added readthedocs.yaml file for new requirements by @fcv-iteratorIt in #43
• Chirpstack V4 docs. by @augusthjerrild in #44
• added api key docs by @augusthjerrild in #45

Full Changelog: v1.5.0...v1.6.0