Update tsconfig lib (#94)

Align with jupyterlab/jupyterlab#16288 for 4.3.0+

Author: fcollonval

template/tsconfig.json

@@ -6,6 +6,7 @@
     "esModuleInterop": true,
     "incremental": true,
     "jsx": "react",
+    "lib": ["DOM", "ES2018", "ES2020.Intl"],
     "module": "esnext",
     "moduleResolution": "node",
     "noEmitOnError": true,