The release script cannot handle non standard tags

bob.ip.qualitymeasure has a tag named biosig2016-replay-mobile: https://gitlab.idiap.ch/bob/bob.ip.qualitymeasure/tags and the release script fails on it with the following error:

Processing package * bob.ip.qualitymeasure

Traceback (most recent call last):
  File "release_bob.py", line 479, in <module>
    package=arguments['--package'], resume=arguments['--resume'])
  File "release_bob.py", line 461, in main
    changelog[pkgs[i] + 1: pkgs[i + 1]], dry_run)
  File "release_bob.py", line 415, in parse_and_process_package_changelog
    cur_tag = get_parsed_tag(gitpkg, line[3:].strip())
  File "release_bob.py", line 164, in get_parsed_tag
    latest_tag_name = get_latest_tag_name(gitpkg)
  File "release_bob.py", line 144, in get_latest_tag_name
    tag_names.sort(key=StrictVersion)
  File "conda/envs/admin/lib/python3.6/distutils/version.py", line 40, in __init__
    self.parse(vstring)
  File "conda/envs/admin/lib/python3.6/distutils/version.py", line 137, in parse
    raise ValueError("invalid version number '%s'" % vstring)
ValueError: invalid version number 'iosig2016-replay-mobile'