python 3.5.3 SyntaxError: invalid syntax

[dmitrii-sim]

aiohttp-graphql/aiohttp_graphql/graphqlview.py

Line 39 in a7aa6c6

**execution_options,

Hi! I'm using python 3.5.3.
This line cause SyntaxError: invalid syntax exception because of trailing comma.
I think it should be removed for compatibility with older python versions.
Thank you!

[zzkate]

+1 Python 3.5.6