Bump version: 0.17.1 → 0.18.0

Separated bumpversion.cfg to avoid removing comments from setup.cfg

Merge pull request nteract#288 from ctb/fix/tqdm_version

update requirements.txt to pin tqdm version >= 4.29.1

Added changelog for 0.17.0

Updated CHANGELOG for release

Updated changelog for 0.16.1

Updated CHANGELOG for 0.16.0

Updated changelog for 0.15.1

Changed author_email

Updated CHANGELOG