D Chukhin

Results 2 issues of D Chukhin

When trying to do a deploy (`fab deploy_serial:,`) from within a virtual environment with Python3.8.3, I get the following pickling error: `AttributeError: Can't pickle local object '_execute..inner'`. Looking deeper, this...

This pull request replaces the version 1 CircleCI config file with the version 2 CircleCI config file.