Update Python versions and introduce type hints (#17) * Fixed typo on line 377 (at least for me). Changed m = [2] to m = 2. Solved my issues * Have to commit local changes * keep latest files, i.e., not minipar * initial updating of python version * update python versions for testing * typing optimparallel * passing local tests * bump version * remove realtive imports * run ci on all branches and periodically * run ci on all branches and periodically * use future annotations for testing on 3.9