Bump version from 2.0.3 to 2.2.0 

Merge pull request #19 from not-a-feature/dev update python version

Merge pull request #16 from not-a-feature/dev remove duplicate key. Fixes #14

Merge pull request #13 from not-a-feature/dev Update to v2.0.1: two-key structure

Merge pull request #12 from not-a-feature/dev bumb version

Merge pull request #9 from not-a-feature/dev bump version

Merge pull request #9 from not-a-feature/dev bump version

Merge pull request #6 from not-a-feature/dev Black code formatting

Merge pull request #5 from not-a-feature/dev Move file