Update CONTRIBUTING.rst

changed easy issues to good first issues

Author: mjherzog

CONTRIBUTING.rst

@@ -9,7 +9,7 @@ Every little bit helps, and a credit will always be given.
 __ issues_
 
 If you are new to ScanCode and want to find easy tickets to work on,
-check `easy issues <https://github.com/nexB/scancode-toolkit/labels/easy>`_
+check `good first issues <https://github.com/nexB/scancode-toolkit/labels/easy>`_
 
 When contributing to ScanCode (such as code, bugs, documentation, etc.) you
 agree to the Developer `Certificate of Origin <http://developercertificate.org/>`_