chore(deps): update devdependency eslint to v7

Author: renovate-bot

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^7.1.1",
-    "eslint": "^3.15.0",
+    "eslint": "^7.26.0",
     "eslint-config-standard": "^6.2.1",
     "eslint-loader": "^1.6.1",
     "eslint-plugin-html": "^2.0.0",