This update for helm-mirror fixes the following issues:

- Getting charts now only downloads the altest versions of the charts. (bsc#1153244)
- The --all-versions flags allows to download all versions of the charts. (bsc#1153244)
- The flags --chart-name and --chart-version allow the user to only get the desired chart. (bsc#1153244)
- Fixes issue with go module when installing with `helm plugin install`. (bsc#1153244)

This update was imported from the SUSE:SLE-15:Update update project.