Fix hydration blocker attributes forwarding

Fixes maoberlehner#96

Author: paulnta

src/utils/hydration-blocker.js

@@ -83,7 +83,7 @@ export function makeHydrationBlocker(component, options) {
       },
       render(h) {
         return h(this.Nonce, {
-          attrs: this.$attrs,
+          attrs: Object.assign({}, this.$attrs),
           on: this.$listeners,
           scopedSlots: this.$scopedSlots,
         }, this.$slots.default);