Update README.md

dynamicscode · web-flow · commit b50ebdbabba1 · 2019-05-11T00:15:56.000+12:00
diff --git a/README.md b/README.md
@@ -24,3 +24,8 @@ Xrm.Portal.Form.get(attributename).setDisable(bool);
 Xrm.Portal.Form.get(attributename).setRequired(bool); //Default - a default validation and a default message
 Xrm.Portal.Form.get(attributename).setRequired(bool, function, message); //A custom validation and a custom message
 ```
+## Attach/Remove OnChange event of an attribute
+```
+Xrm.Portal.Form.get(attributename).attachOnChange(callback);
+Xrm.Portal.Form.get(attributename).removeOnChange();
+```
