message: fix(md-enhance): fix mathjax type
diff: @@ -160,7 +160,7 @@ export interface MathjaxCommonOutputOptions {
  /**
  * RFDa and other attributes NOT to copy to the output
  */
  - skipAttributes: Record<string, boolean>;
  + skipAttributes?: Record<string, boolean>;
  /**
  * default size of ex in em units
  