Merge pull request #223 from bruceadams/master

Discovery create_collection must send JSON

Author: jsstylos

watson_developer_cloud/discovery_v1.py

@@ -222,7 +222,7 @@ def create_collection(self,
             environment_id)
         return self.request(method='POST',
                             url=url_string,
-                            data=data_dict,
+                            json=data_dict,
                             params={'version': self.version},
                             accept_json=True)