default for `github_release_versions` and `github_release_version_current` is `local = TRUE`

[wcornwell]

Feels a bit counter-intuitive to me that the default for github_release_versions and github_release_version_current is local = TRUE. I think this is partly a function naming issue. If the function were called release_versions it would be logical to pass in a location value which could be local, github, zenodo, whatever...

Just a note for whenever the next version happens.

[wcornwell]

This is a very minor issue, only came across this because it would be nice to have a function in taxonlookup that gets the most recent version from github.