I just test locally after you merged it and everything is working fine (npm install . -> npm test). But I didn't know that GitHub was able to link ```git+https://github.com/Benvie/harmony-collections.git#e02bb492c275753cbee66a05b002cd57db3d80a7``` to my PR on https://github.com/SamyPesse/harmony-collections/commit/e81b4b808359e2def9eeeabfdee69c2989e1fe96 which is still not merged by @balevine. So I guess GitHub is adding the PR as special branches on the origin repository.

Do you prefer changing the url to ```git+https://github.com/SamyPesse/harmony-collections.git#e02bb492c275753cbee66a05b002cd57db3d80a7``` or not?