Add recent angular versions as peer dependencies

Author: codez

projects/angular-dropdown/package.json

@@ -14,8 +14,8 @@
   },
   "homepage": "https://github.com/topaxi/angular-dropdown#readme",
   "peerDependencies": {
-    "@angular/common": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 || ^8.0.0",
-    "@angular/core": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 || ^8.0.0",
+    "@angular/common": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
+    "@angular/core": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 || ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
     "ng-wormhole": "^3.0.0",
     "rxjs": "^6.0.0"
   }