* Problem: Source files contain no license info
Solution: Add comments with SPDX license info to source files
* Python 3 files don't need # -*- coding: utf-8 -*-
* Fixed 2 PEP257 compliance errors
* Upgrade Tendermint to 0.19.7 except for Docker image, which is still at 0.19.2
* Problem: Docs say Crypto Conditions are part of ILP
Solution: Edit the docs so they no longer say that