Prepare for v1.1 release.

Reviewed in https://codereview.appspot.com/7516045/.
diff --git a/setup_oauth2client.py b/setup_oauth2client.py
index b02348b..19f14b5 100644
--- a/setup_oauth2client.py
+++ b/setup_oauth2client.py
@@ -24,7 +24,7 @@
 ]
 
 install_requires = [
-    'httplib2>=0.7.7',
+    'httplib2>=0.8',
     'python-gflags',
     ]