WIP: V1.0 releases

I propose we use this branch to maintain the old version until the new version is ready to be released. Need to test in order to make sure that this works with Python 3.8. There was an issue raised by @worktoph which pointed out that the source of all troubles was scipy and we had to bump its minor version by one. I attempt to solve this by removing some explicit dependencies and bumping the version of scikit-learn.