Update hooks and use autopep8 + add-trailing-comma instead of black

[mxr]

reorder-python-imports and black are incompatible (psf/black#4175). This blocks automatic pre-commit updates (#1912). As a workaround, replace black with autopep8 and add-trailing-comma

[asottile]

I'm in favor, we'll see what @sigmavirus24 thinks -- this at least would allow us to get updates. we lose some of the automatic formatting that black decides though

maybe add-trailing-comma could get us the rest of the important parts though?

[sigmavirus24]

I'm 👍 on anything that gets auto-updates working again

[mxr]

@asottile @sigmavirus24 sounds like we are all on the same page. This PR is tidied up from my side now. Thank you!