4.2.0-beta - Adding pytests

Changes in 4.2.0-beta

This release is a maintenance release, that adds validation of the code (HACS/Hassfest) and adds testing of the ble_parser code (pytest). This will help preventing coding errors in the future, as every new release will now be checked automatically. Current implementation only tests the ble_parser, tests for other aspects need to be added in the future.