chore: remove @angular/animations from peerDeps

@angular/animations are not required for every Angular applications.
When installing `nativescript-angular`, the user shouldn't see a warning
for unmet peer dependency if he's not using @angular/animations.

Author: sis0k0

nativescript-angular/package.json

@@ -47,7 +47,6 @@
     "@angular/common": "~4.0.0",
     "@angular/compiler": "~4.0.0",
     "@angular/platform-browser": "~4.0.0",
-    "@angular/animations": "~4.0.0",
     "@angular/router": "~4.0.0",
     "@angular/forms": "~4.0.0",
     "@angular/http": "~4.0.0",