Upgrade the environment to "Pendulum-v1". (#492)
Summary:
The updated gym environment doesn't support "Pendulum-v0" environment anymore and should be replaced with "Pendulum-v1"
Pull Request resolved: https://github.com/pytorch/benchmark/pull/492
Test Plan: OSS CI
Reviewed By: aaronenyeshi
Differential Revision: D31481238
Pulled By: xuzhao9
fbshipit-source-id: 2a27cd8662392330b4fe3d908cb82d985022f93d
