chore(demos): temporary revert to es5 build target

Author: damyanpetev

tsconfig.json

@@ -2,14 +2,14 @@
     "compileOnSave": false,
     "compilerOptions": {
         "baseUrl": "./",
-    "module": "esnext",
+        "module": "esnext",
         "outDir": "./dist/out-tsc",
         "sourceMap": true,
         "declaration": false,
         "moduleResolution": "node",
         "emitDecoratorMetadata": true,
         "experimentalDecorators": true,
-        "target": "es2015",
+        "target": "es5",
         "typeRoots": [
             "node_modules/@types"
         ],