Hi, It seems this bug was already fixed by #954640, and you should use latest 
humanfriendly/8.1-2.

  python3-humanfriendly: humanfriendly.terminal module missing from package
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954640

http://qa-logs.debian.net/2020/03/21/cyvcf2_0.11.6-1_unstable.log
indicates that it uses humanfriendly/8.1-1 (old version).
This package lacks humanfiriendly.terminal module.

FYI: Here is the d/changelog about 8.1-2

 Changes:
 humanfriendly (8.1-2) unstable; urgency=medium
 .
   * Team upload.
 .
   [Christian Pommranz]
 .
   * Install humanfriendly.terminal module (Closes: #954640)

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