Potential typo in `lambert.m`

[jdc-pub]

On line 627 of lambert.m, should r1vec be listed as an argument twice? It seems like the third argument to minmax_distances should instead be r2vec.

Current Code

    extremal_distances = minmax_distances(r1vec, r1, r1vec, r2, dth, a, V1, V2, m, muC);

Proposed

    extremal_distances = minmax_distances(r1vec, r1, r2vec, r2, dth, a, V1, V2, m, muC);

Also, for your awareness, I've ported these functions to Julia over here. I followed the instructions in the BSD license listed to properly show credit, etc. Please let me know if you have any questions.

Thanks!