Update to Angular 6 (#1)

src/environments/environment.ts

@@ -1,8 +1,15 @@
-// The file contents for the current environment will overwrite these during build.
-// The build system defaults to the dev environment which uses `environment.ts`, but if you do
-// `ng build --env=prod` then `environment.prod.ts` will be used instead.
-// The list of which env maps to which file can be found in `.angular-cli.json`.
+// This file can be replaced during build by using the `fileReplacements` array.
+// `ng build ---prod` replaces `environment.ts` with `environment.prod.ts`.
+// The list of file replacements can be found in `angular.json`.
 
 export const environment = {
   production: false
 };
+
+/*
+ * In development mode, for easier debugging, you can ignore zone related error
+ * stack frames such as `zone.run`/`zoneDelegate.invokeTask` by importing the
+ * below file. Don't forget to comment it out in production mode
+ * because it will have a performance impact when errors are thrown
+ */
+// import 'zone.js/dist/zone-error';  // Included with Angular CLI.