Extra semicolon in client.py

[ShunSakurai]

https://github.com/Asana/python-asana/blob/master/asana/client.py

There's an extra semicolon at the end of the line 125.
Please delete it. Thanks!

changes = res_headers[change_header_key].split(',');

[rossgrambo-zz]

Thanks! I went ahead and removed it. It'll be included in the next deploy.