What does this implement/fix? Explain your changes.

Added a not to PR Github template to remind contributors to sign CLA

Does this close any currently open issues?

N/A

Any other comments?

N/A

Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change: ⚠️ N/A
• If an enhancement PR, please create docs and at best an example: ⚠️ N/A
• Add yourself to AUTHORS
• Updated the CHANGELOG