fix(update): don't do anything if nothing has changed

fix: remove invalid character

feat: update mypy

feat: add debugging tools

refactor: make sure that spaces are consistent

docs: this repo is opinionated

docs: description for used tools

docs: fix invalid syntax

docs: python 3.9 is supported by default

feat: better PR title

feat: more flake8 plugins :)

feat: no need to run tests if update was not succesful

fix: execution of pre-commit validations

feat: check if autoupdate was successful

docs: fix grammar and add missing link