Update download.sh

[minor] update README.md

Merge pull request #8 from Hanrui-Wang/master

[minor] change data_root

[major] no longer append additional (s, a, r) to the replay buffer after each episode

[minor] fix logdir in amc_fine_tune

Merge pull request #7 from Hanrui-Wang/master

[minor] update package versions

[minor] revert the bug fix, waiting for verification

[major] bug fix: no longer append additional (s a r) pair to the replay buffer after one episode is done

[minor] specify the shell

[minor] fix log_dir -> logdir for SummaryWriter

[minor] fix async -> non_blocking

Bug fix.

Bug fix.