Added python jwt_token_creds interop test
diff --git a/setup.py b/setup.py
index f96824f..0e2646d 100644
--- a/setup.py
+++ b/setup.py
@@ -202,7 +202,7 @@
 }
 
 TESTS_REQUIRE = (
-    'oauth2client>=1.4.7',
+    'oauth2client>=2.1.0',
     'protobuf>=3.0.0a3',
     'coverage>=4.0',
 ) + INSTALL_REQUIRES