Update comment to reflect the Github-backed skeleton model (preferred to the generation library-backed model).

setup.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
-# Generated by jaraco.develop 2.27.1
-# https://pypi.python.org/pypi/jaraco.develop
+
+# Project skeleton maintained at https://github.com/jaraco/skeleton
 
 import io
 import sys