Implement use_depsy_badge #68
Description
Depsy is a NSF funded project that consists on
[A] free website launched in November 2015 that aims to “measure the value of software that powers science”. (nature, Jan 2016)
In simple terms, Depsy provides the unsung heroes of scientific software with a simple way of measuring the value of their contribution to the scientific community.
In practice, Depsy ranks software (published on PyPI and CRAN) and provides information about usage and citation of those software projects. Ultimately, such rank can be reported on a project website with a badge, e.g. the devtools Depsy badge: 
I think having a use_depsy_badge function would be nice. If you think so too, I can provide a PR with such functionality based on this issue as a wrapper of use_badge.