[Twisted-Python] Twisted Conch on v19.2.1: now requires explicit installation of bcrypt

[Tobias Oberstein]

Hi,

I'm not sure if it considered a Twisted bug, but Twisted Conch on 
Twisted 19.2.1 now seems to require explicit installation of bcrypt, 
which wasn't the case on <19.2.1.

Here is our (Crossbar.io) tracking issue:

https://github.com/crossbario/crossbar/issues/1555

Not a big deal obviously - we'll add that (indirect) dependency to 
Crossbar.io .. just wanted to post here if anyone else runs into.

Cheers,
/Tobias

PS: I did test the upcoming Twisted release with Crossbar.io - but only 
a "quick manual test", not our full CI - which now ran red (by being 
triggered from an unrelated PR).

There is more fallout for us with the new Twisted release:( Analyzing 
that now. We (Crossbar.io) really should have run our _full_ CI on the 
upcoming release.