chore: update dependency eslint to v7.20.0

Author: renovate-bot

package-lock.json

@@ -97,7 +97,7 @@
     "@babel/register": "7.12.13",
     "ava": "2.4.0",
     "babel-eslint": "10.1.0",
-    "eslint": "7.19.0",
+    "eslint": "7.20.0",
     "eslint-config-prettier": "8.0.0",
     "eslint-plugin-prettier": "3.3.1",
     "flow-bin": "0.131.0",