v0.8.5

StatGeochem v0.8.5

Diff since v0.8.4

• Fixed the mole fractions warning in perplex_query_phase
• Excluded O2 from perplex_phase_is_solid

Merged pull requests:

• add O2 to perplex_phase_is_solid (#76) (@jannittayao)
• Fix mole frac warning in perplex_query_phase (#77) (@jannittayao)
• Bump version to 0.8.4 (#78) (@jannittayao)
• update version to 0.8.5 (#79) (@jannittayao)