feat(@schematics/angular): scaffold new projects with angular packages version 8

Author: Alan

packages/schematics/angular/utility/latest-versions.ts

@@ -8,7 +8,7 @@
 
 export const latestVersions = {
   // These versions should be kept up to date with latest Angular peer dependencies.
-  Angular: '~7.2.0-rc.0',
+  Angular: '~8.0.0-beta.0',
   RxJs: '~6.3.3',
   ZoneJs: '~0.8.26',
   TypeScript: '~3.2.2',