Update README.rst

Author: Joohwan Oh

README.rst

@@ -8,7 +8,7 @@ Driver for ArangoDB REST API
 Overview
 --------
 
-py-arango is a driver for ArangoDB (https://www.arangodb.com/) REST API
+py-arango is a Python (2.7) driver for ArangoDB (https://www.arangodb.com/)
 
 Documentation
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