add missing newline

lib/python/qmk/maintainers.py

@@ -25,4 +25,4 @@ def maintainers(file):
             maintainers = ['@' + maintainer for maintainer in maintainers]
 
     for maintainer in maintainers:
-        yield '@qmk/collaborators' if maintainer == 'qmk' else maintainer
+        yield '@qmk/collaborators' if maintainer == 'qmk' else maintainer