v0.4.0

BondGraphs v0.4.0

Diff since v0.3.1

Closed issues:

• Interface for specifying ports (#59)

Merged pull requests:

• added bgplot using graphmakie (#61) (@jedforrest)
• bgplot is now GraphMakie.graphplot (#64) (@jedforrest)
• Port connect (#66) (@jedforrest)
• Minor doc fix (#67) (@jedforrest)