Added warnings to move from master branch to stable branchi

README.md

+
+**NOT MAINTAINED ANYMORE**
+Please use the up-to-date version on the [stable branch](https://github.com/esrlabs/git-repo/tree/stable).
+
 ## Repo for Microsoft Windows and Linux ##
 
 Note: No support for Mac (untested).

main.py

@@ -529,5 +529,9 @@ def _Main(argv):
 
 
 if __name__ == '__main__':
+    print('!! NOT MAINTAINED ANYMORE !!')
+    print('Please use the up-to-date version on the stable branch: https://github.com/esrlabs/git-repo/tree/stable')
+    print('')
+
     result = _Main(sys.argv[1:])
     sys.exit(result)