fatal: Could not parse object 'd31d0df0bc2f1836eb26f419aa3633f613d7719f'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at d31d0df Cleaned up contribution docs, and removed installation doc file.
d31d0df0bc2f1836eb26f419aa3633f613d7719f