Fix .babelrc to be the same as react-sdk

it was missing some plugins which firstly means we're using inconsistent
js between projects, but also causes builds to fail due to our unique
build system.

.babelrc

@@ -1,4 +1,21 @@
 {
-  "presets": ["react", "es2015", "es2016"],
-  "plugins": ["transform-class-properties", "transform-object-rest-spread", "transform-async-to-bluebird", "transform-runtime", "add-module-exports"]
+    "presets": [
+        "react",
+        "es2015",
+        "es2016"
+    ],
+    "plugins": [
+        [
+            "transform-builtin-extend",
+            {
+                "globals": ["Error"]
+            }
+        ],
+        "transform-class-properties",
+        "transform-object-rest-spread",
+        "transform-async-to-bluebird",
+        "transform-runtime",
+        "add-module-exports",
+        "syntax-dynamic-import"
+    ]
 }