fix(package): update @angular/platform-browser to version 5.1.1

Closes #119

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
     "@angular/core": "^4.1.3",
     "@angular/forms": "^4.1.3",
     "@angular/http": "^4.1.3",
-    "@angular/platform-browser": "^4.1.3",
+    "@angular/platform-browser": "^5.1.1",
     "@angular/platform-browser-dynamic": "^4.1.3",
     "@angular/router": "^4.1.3",
     "angular-in-memory-web-api": "^0.3.2",