`Connection.notifies()` should have a generator type hint

[richli]

When using mypy on the example code in the asynchronous notifications documentation, it doesn't consider iterators to have a close() method:

$ mypy --pretty test.py
test.py:8: error: "Iterator[Notify]" has no attribute "close"
            gen.close()
            ^
Found 1 error in 1 file (checked 1 source file)

With the type changed to a typing.Generator, then mypy is happy with it.

def notifies(self) -> Generator[Notify, None, None]: ...

[dvarrazzo]

Seems right, thank you for the report