Re-format codebase using pre-commit settings

[benji011]

ref: https://github.com/chris-greening/instascrape/pull/35 -In the linked PR I introduced config files for pre-commit to automatically sort order of imports, lint checking with flake8 and auto-formatting with black. -The changes in this PR is the result of the set pre-commit

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[chris-greening]

Yesssss so clean 🙌, I've been so focused on getting the codebase to a stable condition I haven't had time to standardize or worry about formatting. This is gonna really legitimize the project, great work!