0.15.5 release notes
release 0.15.4; bump version; release notes
bump version to 0.15.3, release notes
fix test_envs
replace release notes with 0.15.1, update Taxi env registration logic… … to Taxi-v3
0.15.0 + release notes
update travis yaml
fix readme
bump version to 0.13.0, update release notes
bump version, update release notes in README.rst