removed optional mask implementation

changelog.txt

@@ -28,4 +28,8 @@ version 0.2.3
 
 version 0.2.5
 
-- (simple) optional masks    ex:  $(selector).inputmask('9999[aaaa]9999');
+- (simple) optional masks    ex:  $(selector).inputmask('9999[aaaa]9999');
+
+version 0.2.8a
+
+- removed optional mask implementation