Update dependency eslint to v7

Author: renovate-bot

package.json

@@ -57,7 +57,7 @@
     "@typescript-eslint/eslint-plugin": "2.25.0",
     "@typescript-eslint/parser": "2.25.0",
     "cross-env": "7.0.2",
-    "eslint": "6.8.0",
+    "eslint": "7.13.0",
     "eslint-config-prettier": "6.11.0",
     "eslint-plugin-import": "2.22.0",
     "husky": "4.2.5",