v3.25.0

What's Changed

• change error token logic; refactored the parser to treat the error token as a terminal symbol in #13
• add function call and $sep syntax in #14
  $sep( P, P_separator, *|+ ): A repetition of P separated by P_separator. The repetition can be *, or + to indicate zero or more, or one or more repetitions respectively

Full Changelog: v3.24.0...v3.25.0