chore(bower): relax angular restrictions

bower.json

@@ -25,7 +25,7 @@
     "tests"
   ],
   "dependencies": {
-    "angular": ">=1.4 <=1.5.8",
+    "angular": ">=1.4 <1.6.0",
     "angular-cookie": "~4.1.0"
   }
 }