Bump version number to 1.4.1

Bump version number to 1.4.0

Bump version to 1.3.1

Bump version to 1.3.0

Bump version to 1.2.1

Bump version number to 1.2.0

Use comment instead of System.Version

`System.Version` indicates slightly different information than semantic
versioning.

Bump version number to 1.0.1

Add version number to main class