v0.2.20

ACSets v0.2.20

Diff since v0.2.19

Merged pull requests:

• Render API Reference page (#140) (@lukem12345)
• Declare Meta before using it in @intertypes (#141) (@Keno)
• Add equations to schemas (#142) (@kris-brown)
• Fix nauty interface bug + add more documentation (#143) (@kris-brown)

Closed issues:

• Recover schema axioms from ACSet type (#10)
• API Reference page not loading (#139)