add BibTeX entry for Heinlein submission (closes #10)

07f2910f-03c6-46e8-a33d-7a4db94df9a1/sub.bib

-@article{honold2016classification,
-title={Classification of large partial plane spreads in {PG}(6, 2) and related combinatorial objects},
-author={Honold, Thomas and Kiermaier, Michael and Kurz, Sascha},
-journal={arXiv preprint arXiv:1606.07655},
-year={2016}
+@article{honold2016classification,
+title={Classification of large partial plane spreads in {PG}(6, 2) and related combinatorial objects},
+author={Honold, Thomas and Kiermaier, Michael and Kurz, Sascha},
+journal={arXiv preprint arXiv:1606.07655},
+year={2016}
+}
+
+@article{heinlein2017new,
+title={A new upper bound for subspace codes},
+author={Heinlein, Daniel and Kurz, Sascha},
+journal={arXiv preprint arXiv:1703.08712},
+year={2017}
 }
\ No newline at end of file