* support tf2.x and python3.8
* tensorflow==2.2.0rc3 for python3.8
* stick with tf2.1 and py3.7 for now
* More gail visual steps in simple test (#3836)
* increase gail visual ppo steps
* increase to 2000
* tune steps down to 750
Co-authored-by: andrewcoh <54679309+andrewcoh@users.noreply.github.com>
* use py3.8, install cmake for onnx
* disable other circleci tests for now
* install proto for onnx install
* apt-get install protobuf-compiler instead
* skip onnx for python3.8
* use right comparison
* fix up config
* changelog and faq