✨ Updated supported python versions. (#14)

📝 Fixed more images in the documentation

📝 Fixed the README.md

📝 Improved documentation (#11)

* Improved the general documentation about what PyTest-Locker is and does.

* Fixed the double h1 element

* Improved the images in the docs.

Uses align="center" again since that works nicer with githubs md parses.

Updated dependencies, updated codes accordingly

Updated README.rst