Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/README.md b/README.md
index 03bdf8c..9d11c67 100644
--- a/README.md
+++ b/README.md
@@ -16,9 +16,7 @@
 See the [Developers Guide](https://developers.google.com/api-client-library/python/start/get_started) for more detailed instructions and additional documentation.
 
 # Python Version
-Python 2.6 or 2.7 are fully supported.
-
-Python 3.3 and 3.4 are supported and tested. This library may work on later versions of 3, but we do not currently run tests against those versions.
+Python 2.7, 3.3, and 3.4 are fully supported and tested. This library may work on later versions of 3, but we do not currently run tests against those versions.
 
 # Third Party Libraries and Dependencies
 The following libraries will be installed when you install the client library: