fix error due to mix upgrade

Author: Monaye Win

dist/js/field.js

@@ -185,7 +185,7 @@ module.exports = __webpack_require__(13);
 /***/ (function(module, exports, __webpack_require__) {
 
 Nova.booting(function (Vue, router, store) {
-  Vue.component("index-simple-link-button", __webpack_require__(3));
+  Vue.component("index-simple-link-button", __webpack_require__(3).default);
 });
 
 /***/ }),

resources/js/field.js

@@ -1,3 +1,3 @@
 Nova.booting((Vue, router, store) => {
-  Vue.component("index-simple-link-button", require("./components/IndexField"));
+  Vue.component("index-simple-link-button", require("./components/IndexField").default);
 });

src/SimpleLinkButton.php

@@ -72,18 +72,21 @@ public function attributes($attributes)
     public function classes($classes)
     {
         $this->classes = $classes;
+        
         return $this;
     }
 
     public function style($style)
     {
         $this->style = $style;
+
         return $this;
     }
 
     public function type($type)
     {
         $this->type = $type;
+
         return $this;
     }