Nfp

What's Changed
* A few fixes for rlmolecule and the redox models by pstjohn in https://github.com/NREL/nfp/pull/14


**Full Changelog**: https://github.com/NREL/nfp/compare/0.3.5...0.3.6

quick edits for handling graphs without edges

Adds the pymatgen preprocessor, the RBFExpansion layer (Radial Basis Function), and a new inheritance model for preprocessor classes that leverages networkx.

What's Changed
* Issues with conda-forge tf2.6 by pstjohn in https://github.com/NREL/nfp/pull/13


**Full Changelog**: https://github.com/NREL/nfp/compare/0.3.3...0.3.4

What's Changed
* New dataset and preprocessor edits by pstjohn in https://github.com/NREL/nfp/pull/12


**Full Changelog**: https://github.com/NREL/nfp/compare/0.3.0...0.3.1