Update data-science-career.md
Update data-science-career.md

Redundant "of course"
1iyiwei/pyml,rasbt/python-machine-learning-book,chongyangma/python-machine-learning-book,1iyiwei/pyml,xdnian/pyml,chongyangma/python-machine-learning-book,xdnian/pyml,rasbt/python-machine-learning-book