should rebulk be listed in configuration files?

[yuluc123]

Hi, I notice that rebulk is used as a direct dependency in some code files such as subliminal/matches.py. So should rebulk be listed as a dependency for the project?

additional advantage Directly managing the dependency rebulk can help avoid potencial dependency conflict, such as rebulk support for python 2.7 dropped in rebulk 3.0.0 #1029.