fix(package): update @angular/forms to version 5.1.1

Closes #108

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "@angular/common": "^4.3.6",
     "@angular/compiler": "^4.3.6",
     "@angular/core": "^4.3.6",
-    "@angular/forms": "^4.3.6",
+    "@angular/forms": "^5.1.1",
     "@angular/http": "^4.3.6",
     "@angular/material": "^2.0.0-beta.10",
     "@angular/platform-browser": "^4.3.6",