Update reference to requests library

Author: nbob31

README.md

@@ -164,7 +164,7 @@ service.terminate()
 
 # Send attachement (screenshots)
 
-[python-client](https://github.com/reportportal/client-Python/blob/64550693ec9c198b439f8f6e8b23413812d9adf1/reportportal_client/service.py#L259) uses `request` library for working with RP and the same semantics to work with attachments (data).
+[python-client](https://github.com/reportportal/client-Python/blob/64550693ec9c198b439f8f6e8b23413812d9adf1/reportportal_client/service.py#L259) uses `requests` library for working with RP and the same semantics to work with attachments (data).
 
 There are two ways to pass data as attachment: