fixed typo

README.md

@@ -50,7 +50,7 @@ sub_report.complete()
 All sub-reports are again instances of `ProgressReport`, so you can create more sub-reports for each.
 
 #### error handling
-For now there is now distinct error flag in the report. 
+For now there is no distinct error flag in the report. 
 But you can update the `step_message` prop before marking it as complete to indicate an error.
 
 ```python