Feature/add urlchecker (!27) · Merge requests · Daniel Scheffler / py_tools_ds · GitLab

Merged Daniel Scheffler requested to merge feature/add_urlchecker into master Dec 09, 2020

Added URL checker CI job and fixed all dead URLs.
Removed travis related files.
Re-ordered dependencies.
Added Python 3.9 classifier to setup.py and removed those for <3.6.