v3.2.0

What's Changed

• skip electron in mixture valence calculation by @markleader in #67
• Add enthalpy_units optional argument to Reactant in Python API by @markleader in #66
• Fix/smooth truncation by @markleader in #69
• corrected reported viscosity units by @markleader in #73
• corrected reported typo by @markleader in #74
• Feat/type hinting by @markleader in #75
• added LAST_VALID_SOLUTION convergence enum by @markleader in #77
• make enthalpy_units required in Python API by @markleader in #78

Full Changelog: v3.1.2...v3.2.0 and CHANGELOG.md