flake8 fix

Signed-off-by: Dennis Wambua <[email protected]>

onadata/libs/utils/api_export_tools.py

@@ -481,7 +481,7 @@ def get_async_response(job_uuid, request, xform, count=0):
         else:
             resp = async_status(celery_state_to_status(job.state))
 
-            # append task 
+            # append task result to the response
             if job.result:
                 resp.update(job.result) if isinstance(job.result, dict) else \
                     resp.update({'progress': str(job.result)})