French refactor

1.1.0 / 2022-05-26

• Refactor to use Monitor instead of Mutex
• Add documentation about thread-safety
• Allow ClimateControl.modify to be called without environment variables
• Add test for concurrent access needed to be inside block
• Relax development dependencies

The big one-point-oh

ClimateControl recently passed 50 million downloads (as of March 2021) and has been stable for a number of years; now's the time to cut an official 1.0 release (we probably could've done it years ago, but here we are).

The API has consistently been stable; there have been no changes between the previous 0.2.0 release and the 1.0.0 release, only documentation changes, dependency updates, and formatting changes.