Usage of black code formatter

[coder2020official]

I'd recommend using black code formatter in the project.

What problem does it solve?
It solves pep 8 issues in code. Since library has a lot of pep 8 issues, I think it'd be better to integrate it into our project.

How does it work?
I can install it, apply changes to our project, then make a PR.

Background
I've already recommended using it, but by that time it wasn't stable and was in beta testing. However, currently, it is stable and it is used by many projects:

Thoughts, @Badiboy ?

[coder2020official]

For more:
https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html

[coder2020official]

We have tests in the repo, so if there're some issues in syntax, tests are gonna fail. So it is backward compatible.

[Badiboy]

Thoughts, @Badiboy ?

My thoughts did not changed since the last time you propose it. I don't see it brings something valuable, so it will be just the waste of time.

However if you want to have fun bringing things that are valueless to my oppininon - do it. You are the active supporter of the library, you have enough rights to do it.

[coder2020official]

It is not valueless. We have to keep project clean. By the way, it is not me who cleans whole code myself - it is an automated system, so it is not waste of time.