The "context" option is not being used to be passed down as the "context_value"

[luisincrespo]

https://github.com/graphql-python/flask-graphql/blob/master/flask_graphql/graphqlview.py#L50

Here you hardcode the context_value to the request object, instead of using the context provided as option (if provided).

[syrusakbary]

This now is merged and tested in master. Closing issue.