I looked very fast over the pr and I have a feeling that some changes to rebar2.config has to be done. You updated the deps only in rebar.config but not also in this file
Coverage increased (+5.4%) to 79.532% when pulling b6dd1a475bd1d6b24786eb09852b58b6bc7ca0b2 on deps-via-hex into d4c220695f2ca538e0e2b10ef33d93ddf8753ec7 on master.
closes #13