Minor updates for integration into GEOSgcm

What's Changed

• Update sediment flux formulation in FENGSHA dust scheme by @rmontuoro in #98
• Clarified keyword usage in call to Mie calculations by @pcolarco in #90
• Edits to make GNU work with GOCART2G by @mathomp4 in #94
• Update CHANGELOG.md by @amdasilva in #99
• Develop by @amdasilva in #100

New Contributors

• @pcolarco made their first contribution in #90

Full Changelog: v2.0.2...v2.0.3