fix: add Cameron Rushton to CODEOWNERS (#89)

Author: damaru-inc

CODEOWNERS

@@ -5,4 +5,4 @@
 # For more details, read the following article on GitHub: https://help.github.com/articles/about-codeowners/.
 
 # These are the default owners for the whole content of the "@asyncapi/python-paho-template" repository. The default owners are automatically added as reviewers when you open a pull request unless different owners are specified in the file.
-* @damaru-inc @derberg @fmvilas @github-actions[bot]
+* @damaru-inc @derberg @fmvilas @CameronRushton @github-actions[bot]