Update dependency eslint-watch to v8

Author: renovate[bot]

app/package.json

@@ -14,7 +14,7 @@
     "eslint": "4.6.1",
     "eslint-config-airbnb-base": "12.0.0",
     "eslint-plugin-import": "2.7.0",
-    "eslint-watch": "3.1.2",
+    "eslint-watch": "8.0.0",
     "nsp": "2.8.1",
     "supervisor": "0.12.0"
   },