cmd/use cmd/install: add --latest to directly install latest release tag

[irkode]

implements: #85

• switch name: --latest switch
• kept `useLatest as name for the flag variable
  • just if latest reads bad for me because it does not check if its latest but tells to use the latest version

[jmooring]

In addition to these minor comments, this doesn't work when sortAscending = true.

[jmooring]

The easiest way to handle this is to add a latestTag field to the repository struct and populate it from fetchTags() after filtering out non-semver tags but before the optional sort.

[jmooring]

I guess I wasn't clear. Store the latest version (a string) in the struct.

[irkode]

you are always too fast for me - thought we can skip processing the all the tasks - skip futher explanation.
rethinking - having the latest version available may come handy ...

will update , sry

[irkode]

and you are definitely right: much cleaner implementation - sry for the inconvenience

[jmooring]

OK, this looks good. Thanks.