Replace instances of ES6 const keyword with var

lib/proto/attach-form.js

@@ -61,7 +61,7 @@ var formAction = function(el, event) {
 
   el.setAttribute(attrClick, "submit");
 
-  const options = clone(this.options);
+  var options = clone(this.options);
   options.triggerElement = el;
   this.loadUrl(virtLinkElement.href, options);
 };

lib/proto/attach-link.js

@@ -54,7 +54,7 @@ var linkAction = function(el, event) {
   this.options.requestOptions = this.options.requestOptions || {};
   el.setAttribute(attrClick, "load")
 
-  const options = clone(this.options)
+  var options = clone(this.options)
   options.triggerElement = el
   this.loadUrl(el.href, options)
 }