v0.39.0

Korg v0.39.0

Diff since v0.38.0

Merged pull requests:

• Slurm example (#329) (@ajwheeler)
• arbitrary postprocessing in fit_spectrum (#334) (@ajwheeler)
• Fix molecular sigmas when read from file (#335) (@ajwheeler)

Closed issues:

• Save molecular equilibrium results for repeat syntheses (#102)
• documentation for generating grids on a SLURM cluster (#303)