Add the no_version_header option to the configuration file.

[2Pacalypse-]

Hey guys, I was wondering if it would be possible to use the no_version_header option in the typeshare.toml configuration file? This option is quite useful when you run the typeshare automatically as part of the tests/CI pipelines and you want to ensure the correctness of your types without caring about typeshare version number.

For reference, I already left a comment in the PR (#81) that added this option for your internal use, but from what I can tell haven't exposed it for public use.