update rollup config

- update rollup config with object spread support via babel
- add babelrc

Author: Ffloriel

.babelrc

@@ -0,0 +1,20 @@
+{
+  "presets": [
+    [
+      "env",
+      {
+        "modules": false
+      }
+    ]
+  ],
+  "plugins": [
+    "external-helpers",
+    "syntax-object-rest-spread",
+    "transform-object-rest-spread"
+  ]
+
+  // {
+  //   "presets": ["es2015-rollup"],
+  //   "plugins": ["syntax-object-rest-spread", "transform-object-rest-spread"]
+  // }
+}