[Twisted-Python] Twisted v21.2.0 breaks Crossbar.io

[Tobias Oberstein]

Hi all,

rgd Twisted v21.2.0, thanks a lot to all involved in this release! the 
release, mypy, more py3, .. +1! really appreciated.

now, fwiw, just wanted to let you know (sorry, too late) about a 
regression with

https://github.com/crossbario/crossbar

that actually originates from

https://github.com/crossbario/autobahn-python/issues/1470

=>

with Twisted v20.3.0 calling 
twisted.internet.protocol.ProcessProtocol.getPeer raises an AttributeError

with Twisted v21.2.0 calling the same method raises an
NotImplementedError

=>

this fix broke our workaround for the bug now fixed;)

https://github.com/crossbario/autobahn-python/pull/1469/files

and released in:

https://pypi.org/project/autobahn/21.3.1/
https://pypi.org/project/crossbar/21.3.1/

Cheers,
/Tobias