[examples] add ecstatic

Author: ljharb

package.json

@@ -28,6 +28,7 @@
     "devDependencies": {
         "concat-stream": "^1.6.2",
         "eclint": "^2.8.1",
+        "ecstatic": "^4.1.4",
         "eslint": "^6.8.0",
         "falafel": "^2.1.0",
         "js-yaml": "^3.13.1",