Incompatibility with Flask 2.0

[mcejp]

Flask 2.0, which has been recently released, changes the prototype of Blueprint.register

This triggers an exception on this line:

flask-sockets/flask_sockets.py

Line 100 in 003660b

blueprint.register(self, options, first_registration)

[edmorley]

For anyone looking for a replacement to this (deprecated) project, I would check out:
https://github.com/miguelgrinberg/flask-sock