Update nuspec

Author: TomGrobbe

MenuAPI/MenuAPI.nuspec

@@ -8,7 +8,7 @@
     <owners>Tom Grobbe</owners>
     <projectUrl>https://github.com/tomgrobbe/menuapi</projectUrl>
     <description>$description$</description>
-    <copyright>Copyright Tom Grobbe 2018-2020.</copyright>
+    <copyright>Copyright Tom Grobbe 2018-2026.</copyright>
     <tags>$title$</tags>
   </metadata>
 </package>