v4.0.4

ModelingToolkit v4.0.4

Diff since v4.0.3

Closed issues:

• readme example not working (#608)
• "Automated sparse parallelism of ODE's" example failing (#647)

Merged pull requests:

• A nicer error message (#649) (@contradict)
• fix modelingtoolkitize dispatching (#650) (@ChrisRackauckas)