Colored log

[Jakeler]

with https://github.com/xolox/python-coloredlogs

[Jakeler]

Coloring other fields level dependent is currently not possible: xolox/python-coloredlogs#87
Possibly contribute a fix there, meanwhile using the standard colored messages.

Other options:

• works with colors in format string: https://github.com/borntyping/python-colorlog
• only dynamic colors: https://logzero.readthedocs.io/en/latest/#custom-formatting