Actually change the target

Author: React-Admin CI

tsconfig.json

@@ -1,10 +1,10 @@
 {
     "compilerOptions": {
         /* Basic Options */
-        "target": "ES5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
+        "target": "ES2020" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
         "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
         "lib": [
-            "es2017",
+            "ES2020",
             "dom",
         ] /* Specify library files to be included in the compilation. */,
         "allowJs": true /* Allow javascript files to be compiled. */,