fix(@schematics/angular): use updated CLI config schema

Author: clydin

packages/schematics/angular/migrations/update-6/index.ts

@@ -73,7 +73,7 @@ function migrateConfiguration(oldConfig: CliConfig): Rule {
     const configPath = normalize('angular.json');
     context.logger.info(`Updating configuration`);
     const config: JsonObject = {
-      '$schema': './node_modules/@angular-devkit/core/src/workspace/workspace-schema.json',
+      '$schema': './node_modules/@angular/cli/lib/config/schema.json',
       version: 1,
       newProjectRoot: 'projects',
       projects: extractProjectsConfig(oldConfig, host),

packages/schematics/angular/workspace/files/angular.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "./node_modules/@angular-devkit/core/src/workspace/workspace-schema.json",
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
   "version": 1,
   "newProjectRoot": "<%= newProjectRoot %>",
   "projects": {}