Merge pull request #19 from mdnorman/renovate/tsutils-3.x

chore(deps): update dependency tsutils to v3.21.0

Author: mdnorman

package-lock.json

@@ -36,7 +36,7 @@
     "tslint-config-airbnb": "5.11.2",
     "tslint-config-prettier": "1.18.0",
     "tslint-react": "5.0.0",
-    "tsutils": "3.17.1",
+    "tsutils": "3.21.0",
     "typescript": "4.3.5"
   },
   "optionalDependencies": {},