refactor: add @angular/compiler-cli as peerDependency

Author: sis0k0

package.json

@@ -100,6 +100,7 @@
     "typescript": "~2.7.2"
   },
   "peerDependencies": {
-    "@ngtools/webpack": "6.1.0-rc.0"
+    "@ngtools/webpack": "^6.1.0-rc.0",
+    "@angular/compiler-cli": "^6.0.0"
   }
 }