add @angular/animations

Author: linux-china

src/main/frontend/package.json

@@ -17,6 +17,7 @@
     "@angular/core": "^4.2.3",
     "@angular/forms": "^4.2.3",
     "@angular/http": "^4.2.3",
+    "@angular/animations": "^4.2.3",
     "@angular/material": "^2.0.0-beta.7",
     "@angular/platform-browser": "^4.2.3",
     "@angular/platform-browser-dynamic": "^4.2.3",