Update readme with recent API changes

README.md

@@ -94,6 +94,18 @@ defaults = {
 
 Unbinding all event handlers attached to the switch element to prepare the object for garbage collection.
 
+##### .enable()
+
+Enable disabled switch by re-adding event handlers and changing the opacity to 1.
+
+##### .disable()
+
+Disable switch by unbinding attached events and changing opacity to `disabledOpacity` value.
+
+##### .isDisabled()
+
+Check if switch is currently disabled by checking the `readonly` and `disabled` attributes on the checkbox and the `disabled` option set via JS. If any of those are present, the returned value is `true`.
+
 ## Examples
 
 ##### Checked