Bump version to 1.2.1

PyPi didn't like me deleting the 1.2.0 package during testing,
so a new version is needed to upload to PyPi.

Author: Abestanis

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name='txoauth2',
-    version='1.2.0',
+    version='1.2.1',
     author='Sebastian Scholz',
     author_email='abestanis.gc@gmail.com',
     description='A module that allows implementing OAuth2 with twisted',