build: add missing @angular/animations peerDependency (#13182)

Author: SteveVanOpstal

src/lib/package.json

@@ -22,6 +22,7 @@
   },
   "homepage": "https://github.com/angular/material2#readme",
   "peerDependencies": {
+    "@angular/animations": "0.0.0-NG",
     "@angular/cdk": "0.0.0-PLACEHOLDER",
     "@angular/core": "0.0.0-NG",
     "@angular/common": "0.0.0-NG"