chore(deps-dev): bump tslib from 1.10.0 to 2.1.0 in /starter

Bumps [tslib](https://github.com/Microsoft/tslib) from 1.10.0 to 2.1.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](microsoft/tslib@1.10.0...2.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

starter/package.json

@@ -156,7 +156,7 @@
     "npm-run-all": "~4.1.5",
     "parse5": "~6.0.1",
     "ts-node": "~8.10.2",
-    "tslib": "~1.10.0",
+    "tslib": "~2.1.0",
     "typescript": "~3.5.0"
   }
 }