v4.0.3

removed

• wheel is no longer a install-requirement, only a build requiremnt (if user wants wheel support, he can install it, but we shouldn't force it)
• tests_require from setup.cfg, it's not used anyway

changed

• small README formating fixups
• simplifyed dev-install. requirements.txt now containes the editable-self-install. one less setp is reuqired for setup.

added

• mdformat as pre-commit hook