wq.db 0.8.5

wq.db 0.8.5 brings a couple of minor bug fixes:

• don’t override manually defined serializer labels (c5bbd1f34ad1f2758b8a28df3b820f5149835101)
• don’t assume relate model is installed (8f7ff7ed027797f05b1852b81762b53169871854, see https://github.com/powered-by-wq/species.wq.io/issues/3)
• ignore empty attachments (useful when saving new patterns-based models) (e517b7dbeb5425316bb00b58d854472731bac32d)