fix(pencil): Upgraded to Babel 7

Author: Alfred Brockotter

.babelrc

@@ -1,4 +1,10 @@
 {
-  "presets": [ "es2015" ],
+  "presets": [
+    ["@babel/preset-env", {
+      "targets": {
+        "node": "current"
+      }
+    }]
+  ],
   "plugins": ["syntax-async-functions", "transform-regenerator"]
-  }
+}