v3.0.0-rc0

Release candidate

Changes:

• Adds VSCode remote devcontainer (#168)
• Adds support for generating ZSH completion script (#169)
• Adds support for DNS commands (#167)
• Removes addons logo & icons commands (#171)
• Improves command documentation and aliases (#172)
• Updates go modules, removes golang 1.11 support (#170)
• Add homeassistant stats (#173)
• Fixes output of numbers, upgrades Resty v2 (#174)
• Fixes some typos in CLI help (#176)
• Adds backup as alias to snapshots (#177)
• Adds processing spinner and improves command completed message (#175)