Prepare for v1.1 release.

Reviewed in https://codereview.appspot.com/7516045/.
diff --git a/CHANGELOG b/CHANGELOG
index f93c597..4e2a9eb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,31 @@
+v1.1
+  Version 1.1
+
+  Add PEM support to SignedJWTAssertionCredentials (used to only support
+  PKCS12 formatted keys). Note that if you use PEM formatted keys you can use
+  PyCrypto 2.6 or later instead of OpenSSL.
+
+  Allow deserialized discovery docs to be passed to build_from_document().
+
+  - Make ResumableUploadError derive from HttpError.
+  - Many changes to move all the closures in apiclient.discovery into real
+  -  classes and objects.
+  - Make from_json behavior inheritable.
+  - Expose the full token response in OAuth2Client and OAuth2Decorator.
+  - Handle reasons that are None.
+  - Added support for NDB based storing of oauth2client objects.
+  - Update grant_type for AssertionCredentials.
+  - Adding a .revoke() to Credentials. Closes issue 98.
+  - Modify oauth2client.multistore_file to store and retrieve credentials
+    using an arbitrary key.
+  - Don't accept 403 challenges by default for auth challenges.
+  - Set httplib2.RETRIES to 1.
+  - Consolidate handling of scopes.
+  - Upgrade to httplib2 version 0.8.
+  - Allow setting the response_type in OAuth2WebServerFlow.
+  - Ensure that dataWrapper feature is checked before using the 'data' value.
+  - HMAC verification does not use a constant time algorithm.
+
 v1.0
  Version 1.0