message: Downgrade to Angular-CLI 6.1.x
  (due to build problems on AppVeyor)
diff: "@angular-devkit/build-angular": "~0.6.0",
  "@angular/animations": "~6.1.8",
  "@angular/cdk": "~6.4.7",
  - "@angular/cli": "~6.2.7",
  + "@angular/cli": "~6.1.5",
  "@angular/common": "~6.1.8",
  "@angular/compiler": "~6.1.8",
  "@angular/compiler-cli": "~6.1.8",
  