Add breaking changes to CHANGELOG

Add breaking changes with version 1.0.0 to CHANGELOG

CHANGELOG.md

@@ -11,6 +11,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - All commands according to data sheet
 
+### Changed
+
+Note that there are breaking changes compared to 0.1.0
+- The file and class name has changed from SensirionI2CScd4x to SensirionI2cScd4x (the "c" in I2c is now in lower case)
+- all methods that have been named xxxTicks are now named xxxRaw
+- getDataReadyFlag has been renamed to getDataReadyStatus
+
 ## [0.1.0] - 2021-2-1
 
 ### Added
@@ -20,4 +27,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [Unreleased]: https://github.com/Sensirion/arduino-i2c-scd4x/compare/1.0.0...HEAD
 [1.0.0]: https://github.com/Sensirion/arduino-i2c-scd4x/compare/0.1.0...1.0.0
-[0.1.0]: https://github.com/Sensirion/arduino-i2c-scd4x/releases/tag/0.1.0
+[0.1.0]: https://github.com/Sensirion/arduino-i2c-scd4x/releases/tag/0.1.0