fixed license link

Author: ScottGibb

README.md

@@ -1363,7 +1363,7 @@ These materials may be outdated and reflect earlier practices, but they might st
 This list is licensed under
 
 - CC0 1.0 Universal License ([LICENSE-CC0](./LICENSE-CC0) or
-  [license](https://creativecommons.org/publicdomain/zero/1.0/legalcode))
+  https://creativecommons.org/publicdomain/zero/1.0/legalcode)
 
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