v1.3.0

ModelingToolkitStandardLibrary v1.3.0

Diff since v1.2.1

Closed issues:

• add tutorial (#60)

Merged pull requests:

• Correct room temperature value (#54) (@jaakkor2)
• Add smooth sources in Blocks + Add Square and Triangular sources (#59) (@ven-k)
• Adds doc for custom component creation (#61) (@ValentinKaisermayer)
• Adds missing link in doc (#62) (@ValentinKaisermayer)