Add IE11 support

Author: Michael William Le Nguyen

babel.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  presets: [
+    '@vue/cli-plugin-babel/preset'
+  ]
+}

package.json

@@ -9,12 +9,15 @@
   },
   "dependencies": {
     "bootstrap": "4.3.1",
+    "core-js": "3.4.2",
     "material-design-icons": "3.0.1",
     "vue": "2.6.10",
     "vue-class-component": "6.3.2",
-    "vue-property-decorator": "7.3.0"
+    "vue-property-decorator": "7.3.0",
+    "whatwg-fetch": "3.0.0"
   },
   "devDependencies": {
+    "@vue/cli-plugin-babel": "4.0.5",
     "@vue/cli-plugin-typescript": "3.5.1",
     "@vue/cli-service": "3.5.1",
     "tslint-config-standard": "8.0.1",

src/main.ts

@@ -1,3 +1,5 @@
+import 'whatwg-fetch'
+
 import Vue from 'vue'
 import App from './App.vue'