chore(deps): update dependency eslint to v7

Author: renovate-bot

package.json

@@ -23,7 +23,7 @@
     "@nju33/prettier": "0.0.26",
     "@types/jest": "24.9.1",
     "coveralls": "3.1.0",
-    "eslint": "5.16.0",
+    "eslint": "7.3.0",
     "gh-pages": "2.2.0",
     "jest": "24.9.0",
     "lerna": "3.22.1",