Tool version incorrectly reported in Docker

[tillig]

Regardless of the container version, it appears the openapi-changes tool reports the version as latest and the build date/time as whatever the current time is.

Running docker run --rm pb33f/openapi-changes:v0.0.79 summary sample-specs/petstorev3.json sample-specs/petstorev3.json a few seconds apart yields the following:

Note the version (latest) and the changing compile date.

While not the most significant issue, it does make troubleshooting (to see which version of the tool may be having a problem) somewhat difficult.