Fixed up altmetric call

It looks like the doi wasn't being passed correctly. I just added `doi/` to each entry and passed that directly and it worked. Hope this helps. I also discovered a bug in `rImpactStory` but I can patch that up shortly

- [x] Altmetric works fine
- [ ] ImpactStory need a small fix (so API key gets passed correctly. Right now it's not so it returns a forbidden error).