Release v2.0.0

Release 2.0.0b2 (pre-release)

Tianshou v2 (#1259)

See change log.

Resolves #1091 
Resolves #810 
Resolves #959 
Resolves #898 
Resolves #919 
Resolves #913 
Resolves #948 
Resolves #949
Resolves #1204

v1: bumped version, removed bumpversion [ci skip]

Bumpversion doesn't seem to work properly, maybe it never has worked for tianshou

Dependencies: use release of rliable-fork instead of git dependency

Update publish.yaml, typo [skip ci[

update version to 0.5.0 (#826)

fix info not pass issue in PGPolicy (#787)

close #775

bump version to 0.4.10 (#757)

bump version to 0.4.9 (#684)