Run ng update to update to latest Angular 8.3.0

demo/browserslist

@@ -0,0 +1,12 @@
+# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
+# For additional information regarding the format and rule options, please see:
+# https://github.com/browserslist/browserslist#queries
+
+# You can see what browsers were selected by your queries by running:
+#   npx browserslist
+
+> 0.5%
+last 2 versions
+Firefox ESR
+not dead
+not IE 9-11 # For IE 9-11 support, remove 'not'.

demo/src/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "declaration": false,
+    "downlevelIteration": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "noEmitHelpers": false,
@@ -10,11 +11,11 @@
       "webpack"
     ],
     "mapRoot": "./",
-    "module": "es6",
+    "module": "esnext",
     "moduleResolution": "node",
     "outDir": "../temp/out-tsc",
     "sourceMap": true,
-    "target": "es5",
+    "target": "es2015",
     "typeRoots": [
       "../node_modules/@types"
     ]