Upgrade graphiql to fix autocomplete bug

[matt-dalton]

• What is the current behavior?
  It looks like graphene uses 1.0.3 of graphiql. Autocomplete isn't working for me for on Graphene interfaces. This is described in this graphiql issue

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem
  Create an interface field in graphene and try to use autocomplete in graphiql

• What is the expected behavior?
  From the issue above, it looks like it's fixed in graphiql 1.0.6, so perhaps it should be upgraded?

Would this be a straightforward fix?

[matt-dalton]

Thanks for fixing this @zbyte64 and @RainshawGao.

I there a plan for another release soon so we can get this into our project?