Update copyright notice based on root license

linting/stylecop.json

@@ -10,7 +10,7 @@
     "documentationRules": {
       "xmlHeader": false,
       "documentInternalElements": false,
-      "copyrightText": "Copyright (c) Umbraco and contributors.\nSee LICENSE for more details."
+      "copyrightText": "Copyright (c) Umbraco.\nSee LICENSE for more details."
     }
   }
 }

src/Umbraco.Core/Configuration/ICronTabParser.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Umbraco and contributors.
+// Copyright (c) Umbraco.
 // See LICENSE for more details.
 
 using System;