Add GAIL and fix PPO

Release version 1.1.0

Fix test log format

First version

Remove useless requirement (#302)

* Remove useless requirement

* Change activation type on reacher config

* docs: add sehyun-hwang as a contributor (#303)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

* Update ray version

* Fix typo

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Add version and update all requirements