Update dependency eslint to v6.6.0

Author: renovate-bot

package.json

@@ -39,7 +39,7 @@
     "@babel/preset-env": "7.6.0",
     "babel-jest": "24.9.0",
     "del-cli": "3.0.0",
-    "eslint": "6.4.0",
+    "eslint": "6.6.0",
     "eslint-config-prettier": "6.3.0",
     "eslint-config-standard": "14.1.0",
     "eslint-plugin-import": "2.18.2",