Update referer-tests.json

Add new Voila query term (kw)
Merge branch 'patch-2' of github.com:glefait-dbi/referer-parser into glefait-dbi-patch-2
Merge branch 'glefait-dbi-patch-2'
Updated ./resources/referers.yml, referers.json and ./resources/referer-tests.json in sub-folder following update(s) to master copy