Retry on "Uh oh, an error occurred" request exceptions (#1153)

Author: jonmmease

Diff for: plotly/api/v2/utils.py

@@ -117,6 +117,8 @@ def should_retry(exception):
                 500 <= exception.status_code < 600):
             # Retry on 5XX errors.
             return True
+        elif 'Uh oh, an error occurred' in exception.message:
+            return True
 
     return False