Add 2018.4.2f1 and 2019.1.7f

Fetched those with your new generator script, seemed to work pretty good. There's some gaps in versions now though (missed 2019.1.5f1 and 6 for example) - not 100% sure what to do about that or if its even important

There's also a new 2017 version, but the build of that fails (see https://gitlab.com/imer/unity3d/-/jobs/233964169 ), so I left that out