Update detect-port (facebook#1861)

Previous changes caused `detect-port` to pick random port on app startup. Update fixes this regression, `detect-port` pick next available port instead.

Author: Andreyco

packages/react-scripts/package.json

@@ -35,7 +35,7 @@
     "connect-history-api-fallback": "1.3.0",
     "cross-spawn": "4.0.2",
     "css-loader": "0.26.1",
-    "detect-port": "1.1.0",
+    "detect-port": "1.1.1",
     "dotenv": "2.0.0",
     "eslint": "3.16.1",
     "eslint-config-react-app": "^0.6.2",