feat: pass additional parameters to offset callback (#135)

* Add parameter to offset callback function

* build vue-scrollto.js

Author: lukasbesch

src/scrollTo.js

@@ -166,7 +166,7 @@ export const scroller = () => {
         var cumulativeOffsetElement = _.cumulativeOffset(element);
 
         if (typeof offset === "function") {
-            offset = offset();
+            offset = offset(element, container);
         }
 
         initialY = scrollTop(container);

vue-scrollto.js

@@ -378,7 +378,7 @@
       var cumulativeOffsetElement = _.cumulativeOffset(element);
 
       if (typeof offset === "function") {
-        offset = offset();
+        offset = offset(element, container);
       }
 
       initialY = scrollTop(container);