Update doc copyright dates
Update doc copyright dates
petebachant/seaborn,arokem/seaborn,lukauskas/seaborn,anntzer/seaborn,lukauskas/seaborn,anntzer/seaborn,JWarmenhoven/seaborn,arokem/seaborn,mwaskom/seaborn,sauliusl/seaborn,mwaskom/seaborn,phobson/seaborn,phobson/seaborn