chore(package): update @angular/common to version 5.1.2

Closes #11

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "@angular/forms": "^4.0.0"
   },
   "devDependencies": {
-    "@angular/common": "^4.0.0",
+    "@angular/common": "^5.1.2",
     "@angular/compiler": "^4.0.0",
     "@angular/compiler-cli": "^4.0.0",
     "@angular/core": "^4.0.0",