Update plotly.py

Author: jackparmer

plotly/plotly/plotly.py

@@ -1290,10 +1290,11 @@ def response_handler(cls, response):
                     != tools.get_config_defaults()['plotly_api_domain']):
                 raise exceptions.PlotlyError(
                     "This endpoint is unavailable at {url}. If you are using "
-                    "Plotly Enterprise, you may need to upgrade your Plotly "
-                    "Enterprise server to request against this endpoint or "
+                    "Plotly On-Premise, you may need to upgrade your Plotly "
+                    "Plotly On-Premise server to request against this endpoint or "
                     "this endpoint may not be available yet.\nQuestions? "
-                    "support@plot.ly or your plotly administrator."
+                    "Visit community.plot.ly, contact your plotly administrator "
+                    "or upgrade to a Pro account for 1-1 help: https://goo.gl/1YUVu9 " 
                     .format(url=get_config()['plotly_api_domain'])
                 )
             else: