Update distributions.py
Update distributions.py

more white space (pep8) issues
anntzer/seaborn,phobson/seaborn,arokem/seaborn,mwaskom/seaborn,arokem/seaborn,phobson/seaborn,lukauskas/seaborn,lukauskas/seaborn,petebachant/seaborn,anntzer/seaborn,sauliusl/seaborn,mwaskom/seaborn