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

Closes #50

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
   },
   "devDependencies": {
     "@angular/common": "^4.1.3",
-    "@angular/compiler": "^4.1.3",
+    "@angular/compiler": "^5.2.1",
     "@angular/compiler-cli": "^4.1.3",
     "@angular/core": "^4.1.3",
     "@angular/forms": "^4.1.3",