Bump version to 1.0.3 and update release notes

Release 1.0.3 to verify that the project URL now points to the library subfolder instead of the repository root. Updated _releasenotes and _version files accordingly.

Author: malware-dev

libraries/Mal.MdkScriptMixin.Coroutines/Mal.MdkScriptMixin.Coroutines/_releasenotes

@@ -1,3 +1,5 @@
+- 1.0.3
+  Test release to verify project URL now points to library subfolder instead of repository root
 - 1.0.2
   Initial public release
   - Core coroutine scheduler with update frequency management

libraries/Mal.MdkScriptMixin.Coroutines/Mal.MdkScriptMixin.Coroutines/_version

@@ -1 +1 @@
-1.0.2
+1.0.3