v3.0.0a4

Breaking Changes:

• Optional dependencies for transports (#158):
  • It is now necessary to request additional dependencies when installing gql
  • It is no more possible to import transports directly from gql (Sorry...)
  • Please check the new installation documentation

Improvements:

• aiohttp and requests transports logging (#157)
• Better transport exception messages (#155)

Documentation:

• Adding IPython section (#165)
• Adding Logging section (#157)

Maintenance:

• Stable Python 3.9 support (#160)
• Update aiohttp from 3.6.2 to 3.7.1 (#159)