This fixes a compilation error if too many commits were made after the
most recent tag:
fatal: No names found, cannot describe anything.
In src/invidious.cr:60:19
60 | CURRENT_VERSION = {{ "#{`git describe --tags --abbrev=0`.strip}" }}
Error: expanding macro
See https://travis-ci.org/leonklingele/invidious/jobs/588672881#L275-L290.
