v0.9.0

Korg v0.9.0

Diff since v0.8.0

Closed issues:

• continuum absorption accuracy (#83)

Merged pull requests:

• add back test; does it work? (#103) (@ajwheeler)
• WIP: Full metal opacities (#115) (@ajwheeler)
• CompatHelper: bump compat for Interpolations to 0.14, (keep existing compat) (#118) (@github-actions[bot])
• Delete outdated discussion of gray 8.12 and clarify where the cross-s… (#119) (@ajwheeler)
• switch to more precise RydbergH (#120) (@ajwheeler)
• add some notes on Julia developement, remove soon-to-be-outdated note… (#122) (@ajwheeler)