* Update the commands to install Tensorflow
The current 'tensorflow' package is for Tensorflow 2, which is not supported by the master branch of baselines.
* Update command to install Tensorflow 1.14
* Fix RuntimeError (#910)
- Removed interfering calls to env.reset() in play mode.
(Note that the worker in the subprocess is calling env.reset() already)
- Fixed the printed reward when running multiple envs in play mode.