Update README.md

Author: marcominerva

README.md

@@ -140,7 +140,7 @@ When using the `/api/ask-streaming` endpoint, answers will be streamed as happen
 ```
 
 - The first piece of the response has the following characteristics:
-  - the *streamState* property is set to `Start`,
+  - the *streamState* property is set to `Start`
   - it contains the question and its reformulation (if not requested, *reformulatedQuestion* will be equals to *originalQuestion*)
   - the *tokenUsage* section holds information about token used for reformulation (if done) and for the embedding of the question
 - Then, there are as many elements for the actual answer as necessary: