Update primitives from dvdmjohnson/d3m_michigan_primitives@b93a31b2e1b8604ec5ad0230e6abbfa494e6cf21
This commit fixes some bugs revealed by our internal tests:
- Updated GRASTA
- Updated librosa to version 0.6.2 since 0.5.1 yields an internal broadcasting error (example here)
- Freeze Pillow to version 6.2.1