This package is no longer maintained and has been archived on CRAN. If you're interested in altmetrics you might find these other rOpenSci packages interesting:
crevents, Crossref events data R client,
roadoi, that interacts with the Unpaywall API, a simple web-interface which links DOIs and open access versions of scholarly works,
rAltmetricsto query and visualize metrics from altmetric.com.
Code of Conduct
Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.