chore(package): update @angular/common to version 5.2.1

Closes #49

Author: greenkeeper[bot]

package.json

@@ -72,7 +72,7 @@
     "ngx-bootstrap": "^1.6.6"
   },
   "devDependencies": {
-    "@angular/common": "^4.1.3",
+    "@angular/common": "^5.2.1",
     "@angular/compiler": "^4.1.3",
     "@angular/compiler-cli": "^4.1.3",
     "@angular/core": "^4.1.3",