message: Fix license link in readme
  Link is currently broken because the casing doesn't match the filename.
diff: @@ -98,7 +98,7 @@ Kudos to all [contributors](https://github.com/vscode-icons/vscode-icons/graphs/
  ## License
  -The source code is licensed under the [MIT](License) license.
  +The source code is licensed under the [MIT](LICENSE) license.
  The icons are licensed under the [Creative Commons - ShareAlike (CC BY-SA)](https://creativecommons.org/licenses/by-sa/4.0/) license.
  