v0.3.0

AlgebraicRewriting v0.3.0

Diff since v0.2.1

Merged pull requests:

• Visualize constraints (#28) (@kris-brown)
• Partial abstraction / variable substitution+merging (#29) (@kris-brown)
• conegation rewriting (#31) (@kris-brown)
• Update for GATlab.jl and DataMigrations.jl (#32) (@epatters)
• CompatHelper: bump compat for Catlab to 0.16, (keep existing compat) (#35) (@algebraicjuliabot)

Closed issues:

• Conegation rewriting (#18)