angular 11 upgrade

Author: winrid

.gitignore

@@ -45,3 +45,5 @@ testem.log
 # System Files
 .DS_Store
 Thumbs.db
+
+.angular/cache

angular.json

@@ -131,7 +131,7 @@
       "prefix": "lib",
       "architect": {
         "build": {
-          "builder": "@angular-devkit/build-ng-packagr:build",
+          "builder": "@angular-devkit/build-angular:ng-packagr",
           "options": {
             "tsConfig": "projects/fastcomments-angular/tsconfig.lib.json",
             "project": "projects/fastcomments-angular/ng-package.json"
@@ -165,4 +165,4 @@
       }
     }
   }
-}
+}