remove dedicated file for release notes (#841)

superseded via official Github Releases page

README.md

@@ -53,5 +53,4 @@ This software is licensed under [Apache 2.0 license](LICENSE.txt).
 - [Instructions](docs/instructions.md)
 - [Coding standard](docs/coding-standard.md)
 - [API](docs/api.md)
-- [Release notes](docs/releasenotes.md)
 - [FAQ](docs/faq.md)

docs/releasenotes.md

-# Release notes
-
-2022.3.9:
-
-- Enable .zap files to automatically re-load custom XML references (754270)
-
-  2021.10.18:
-
-- Limited support for Custom ZCL device types (446696)
-  If a Custom ZCL device type has overlapping Profile and Device ID with the standard ZCL standard device types, the save / generation process might not behave correctly.
-  A temporary workarounds is to remove the standard ZCL device type from the ZCL XML
-  to accommodate the custom definition.