chore: bump angular version

Author: wesleycho

Diff for: package.json

@@ -22,9 +22,9 @@
     "url": "https://github.com/angular-ui/bootstrap.git"
   },
   "devDependencies": {
-    "angular": "1.5.5",
-    "angular-mocks": "1.5.5",
-    "angular-sanitize": "1.5.5",
+    "angular": "1.5.8",
+    "angular-mocks": "1.5.8",
+    "angular-sanitize": "1.5.8",
     "grunt": "^0.4.5",
     "grunt-contrib-concat": "^1.0.0",
     "grunt-contrib-copy": "^1.0.0",