Minor README change

Author: behackett

README.rst

@@ -16,7 +16,7 @@ is a `gridfs
 <http://www.mongodb.org/display/DOCS/GridFS+Specification>`_
 implementation on top of ``pymongo``.
 
-PyMongo 3.4.0.dev0 supports MongoDB 2.4, 2.6, 3.0, 3.2, and 3.4
+PyMongo 3.4 supports MongoDB 2.4, 2.6, 3.0, 3.2, and 3.4
 
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