v0.4.0

What's Changed

• Change python version requirement to 3.9 by @AchrafDhahbi in #15
• Require (n_params+1) spectra dims by @AchrafDhahbi in #16
• 3-add-new-builtin-phoenix-grid by @tedjohnson12 in #17
• Release/0.4.0 by @tedjohnson12 in #18

Full Changelog: v0.3.2...v0.4.0