MNT: Use mpl >= 1.5.0rc1
MNT: Use mpl >= 1.5.0rc1

- Closes NSLS-II/wishlist#43

ericdill/conda-prescriptions,tacaswell/conda-prescriptions,danielballan/conda-prescriptions,ericdill/conda-prescriptions,danielballan/conda-prescriptions,tacaswell/conda-prescriptions,tacaswell/conda-prescriptions,ericdill/conda-prescriptions