Improve description and README

• Update project description
• Change output.log to main.log

Support Python 3.9

• Support Python 3.9 and drop support for Python 3.6
• Use __future__ annotations

Make loggify compatible with ipdb

• Make loggify compatible with ipdb
• Improve code formatting

Fix __exit__ Nones

• Fix __exit__ Nones

Add first version

• Create initial version