Fix a markdown blip I haven't noticed until now

LICENSE.md

@@ -1,7 +1,7 @@
 MIT License
 
-Copyright (c) 2019-2020 Ultz Limited
-Copyright (c) 2021- .NET Foundation and Contributors
+- Copyright (c) 2019-2020 Ultz Limited
+- Copyright (c) 2021- .NET Foundation and Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal