Citing GPkit

If you use GPkit, please cite it with the following bibtex:

@Misc{gpkit,
      author={Edward Burnell and Warren Hoburg},
      title={GPkit software for geometric programming},
      howpublished={\url{https://github.com/convexengineering/gpkit}},
      year={2018},
      note={Version 0.8.0}
     }