v0.3.0

Insolation v0.3.0

Diff since v0.2.1

Closed issues:

• Long term variations in time of equinox are wrong (#27)
• Using Float32 for latitude/longitude gives incorrect zenith angles (#29)
• Use new CLIMAParameters interface (#36)

Merged pull requests:

• add Milankovitch cycles (#34) (@claresinger)
• Use new way of handling clima parameters (#39) (@charleskawczynski)