.disable() has been removed in Ladda v2

Author: ggregoire

src/LaddaButton.jsx

@@ -79,7 +79,9 @@ class LaddaButton extends Component {
         // .stop removes the attribute "disabled"
         // .disable calls .stop then adds the attribute "disabled"
         // see https://github.com/hakimel/Ladda/blob/master/js/ladda.js
-        this.laddaInstance.disable()
+
+        // Removed in ladda v2
+        //this.laddaInstance.disable()
       } else {
         this.laddaInstance.stop()
       }