Remove trailing newlines before end of class definitions

exceptions/MDConsoleInvalidHeadingNumber.php

@@ -5,7 +5,6 @@
  * Custom exception class for invalid page parameters.
  */
 final class MDConsoleInvalidHeadingNumber extends Exception {
-
     /**
      * Error message.
      *
@@ -17,5 +16,4 @@ public function errorMessage() {
         return $errorMsg;
 
     }
-
 }