Now that we're working on the 3.0.0 major release it is more important
than ever that fish binaries built by developers have version strings
which clearly communicate where they came from.
When calculating the version, we don't need to test for the presence of
.git before running `git describe`. This lets us work properly in a
detached work tree if GIT_DIR is set.
Note: if you have previously cloned the repository, the tags for
previous versions have been edited. Use `git fetch --tags` to
synchronise your local copy.
