bump version to v2.1.0

bump version to 2.1.0rc2

Merge pull request #407 from linien-org/release/v2.0.4

Release v2.0.4

Merge pull request #406 from linien-org/release/v2.0.3

Release v2.0.3

bump version of checkout

bump version and update changelog

Merge pull request #390 from linien-org/release/v2.0.0

Release v2.0.0

rename package data

Merge pull request #389 from linien-org/release/v1.0.2

Release v1.0.2

fix pyinstaller