missing \software{} tag and software citations

From running makecite on the repo, it looks like:

Packages detected with citation information:
    astropy, corner, emcee, matplotlib, numpy, scipy, sklearn

Packages with no citation information:
    mpl_toolkits, normalize_all_spectra, os, pickle, plotting_helpers, subprocess, sys, time

Here's a start:

\software{
    \package{Astropy} \citep{astropy, astropy:2018},
    \package{matplotlib} \citep{mpl},
    \package{numpy} \citep{numpy},
    \package{scipy} \citep{scipy},
    \package{scikit-learn} \citep{scikit-learn}
}

bibtex:

@article{astropy,
    Adsnote = {Provided by the SAO/NASA Astrophysics Data System},
    Adsurl = {http://adsabs.harvard.edu/abs/2013A%26A...558A..33A},
    Archiveprefix = {arXiv},
    Author = {{Astropy Collaboration} and {Robitaille}, T.~P. and {Tollerud}, E.~J. and {Greenfield}, P. and {Droettboom}, M. and {Bray}, E. and {Aldcroft}, T. and {Davis}, M. and {Ginsburg}, A. and {Price-Whelan}, A.~M. and {Kerzendorf}, W.~E. and {Conley}, A. and {Crighton}, N. and {Barbary}, K. and {Muna}, D. and {Ferguson}, H. and {Grollier}, F. and {Parikh}, M.~M. and {Nair}, P.~H. and {Unther}, H.~M. and {Deil}, C. and {Woillez}, J. and {Conseil}, S. and {Kramer}, R. and {Turner}, J.~E.~H. and {Singer}, L. and {Fox}, R. and {Weaver}, B.~A. and {Zabalza}, V. and {Edwards}, Z.~I. and {Azalee Bostroem}, K. and {Burke}, D.~J. and {Casey}, A.~R. and {Crawford}, S.~M. and {Dencheva}, N. and {Ely}, J. and {Jenness}, T. and {Labrie}, K. and {Lim}, P.~L. and {Pierfederici}, F. and {Pontzen}, A. and {Ptak}, A. and {Refsdal}, B. and {Servillat}, M. and {Streicher}, O.},
    Doi = {10.1051/0004-6361/201322068},
    Eid = {A33},
    Eprint = {1307.6212},
    Journal = {\aap},
    Keywords = {methods: data analysis, methods: miscellaneous, virtual observatory tools},
    Month = oct,
    Pages = {A33},
    Primaryclass = {astro-ph.IM},
    Title = {{Astropy: A community Python package for astronomy}},
    Volume = 558,
    Year = 2013,
    Bdsk-Url-1 = {https://dx.doi.org/10.1051/0004-6361/201322068}}

@article{mpl,
    Adsnote = {Provided by the SAO/NASA Astrophysics Data System},
    Adsurl = {http://adsabs.harvard.edu/abs/2007CSE.....9...90H},
    Author = {{Hunter}, J.~D.},
    Doi = {10.1109/MCSE.2007.55},
    Journal = {Computing in Science and Engineering},
    Keywords = {Python, Scripting languages, Application development, Scientific programming},
    Month = may,
    Pages = {90-95},
    Title = {{Matplotlib: A 2D Graphics Environment}},
    Volume = 9,
    Year = 2007,
    Bdsk-Url-1 = {https://dx.doi.org/10.1109/MCSE.2007.55}}

@article{numpy,
    Acmid = {1957466},
    Address = {Piscataway, NJ, USA},
    Author = {Walt, Stefan van der and Colbert, S. Chris and Varoquaux, Gael},
    Doi = {10.1109/MCSE.2011.37},
    Issn = {1521-9615},
    Issue_Date = {March 2011},
    Journal = {Computing in Science and Engg.},
    Keywords = {NumPy, Python, Python, NumPy, scientific programming, numerical computations, programming libraries, numerical computations, programming libraries, scientific programming},
    Month = mar,
    Number = {2},
    Numpages = {9},
    Pages = {22--30},
    Publisher = {IEEE Educational Activities Department},
    Title = {The NumPy Array: A Structure for Efficient Numerical Computation},
    Url = {http://dx.doi.org/10.1109/MCSE.2011.37},
    Volume = {13},
    Year = {2011},
    Bdsk-Url-1 = {http://dx.doi.org/10.1109/MCSE.2011.37}}

@misc{scipy,
    Author = {Eric Jones and Travis Oliphant and Pearu Peterson and others},
    Title = {{SciPy}: Open source scientific tools for {Python}},
    Url = {http://www.scipy.org/},
    Year = {2001--},
    Bdsk-Url-1 = {http://www.scipy.org/}}

@article{scikit-learn,
 title={Scikit-learn: Machine Learning in {P}ython},
 author={Pedregosa, F. and Varoquaux, G. and Gramfort, A. and Michel, V.
         and Thirion, B. and Grisel, O. and Blondel, M. and Prettenhofer, P.
         and Weiss, R. and Dubourg, V. and Vanderplas, J. and Passos, A. and
         Cournapeau, D. and Brucher, M. and Perrot, M. and Duchesnay, E.},
 journal={Journal of Machine Learning Research},
 volume={12},
 pages={2825--2830},
 yea

aceilers / spectroscopic_parallax

missing \software{} tag and software citations #28