Fix: _labels_for_format was returning None labels
Don't fail if parsed tag name contains hyphens.

Guess this was a bit too defensive.

Fixes #51 #52
Groom changelog
add regression test for bug #56
Merge pull request #56 from mskrajnowski/master

Fix: _labels_for_format was returning None labels
groom changelog
Mention search = / replace = in README
groom changelog
Merge remote-tracking branch 'upstream/master'