chore(deps-dev): bump ecstatic from 3.3.2 to 4.1.4

Bumps [ecstatic](https://github.com/jfhbrook/node-ecstatic) from 3.3.2 to 4.1.4.
- [Release notes](https://github.com/jfhbrook/node-ecstatic/releases)
- [Changelog](https://github.com/jfhbrook/node-ecstatic/blob/master/CHANGELOG.md)
- [Commits](jfhbrook/node-ecstatic@3.3.2...4.1.4)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -50,7 +50,7 @@
   "devDependencies": {
     "babel-core": "^7.0.0-bridge.0",
     "bundlesize": "^0.18.0",
-    "ecstatic": "^3.2.1",
+    "ecstatic": "^4.1.4",
     "enzyme": "^3.3.0",
     "enzyme-adapter-react-16": "^1.1.1",
     "npm-run-all": "^4.1.5",