Merge pull request #508 from shucon/patch-1

Update README.md

README.md

@@ -93,7 +93,7 @@ print(response.body)
 print(response.headers)
 ```
 
-The `Mail` constructor creates a [personalization object](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html) for you. [Here](https://github.com/sendgrid/sendgrid-python/blob/master/examples/helpers/mail/mail_example.py#L16) is an example of how to add to it.
+The `Mail` constructor creates a [personalization object](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html) for you. [Here](https://github.com/sendgrid/sendgrid-python/blob/master/examples/helpers/mail/mail_example.py#L16) is an example of how to add it.
 
 ### Without Mail Helper Class