README: fix CONTRIBUTORS.md reference-style link with no definition

[CONTRIBUTORS.md] has no matching link definition, so it renders as
literal bracketed text instead of a link. Make it an inline link to
the file, which exists at the repository root.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: zk-khan

README.md

@@ -16,7 +16,7 @@ To see sample code that works directly with the REST API (in Java, Python, or Po
 For more information on installing and using TSC, see the documentation:
 <https://tableau.github.io/server-client-python/docs/>
 
-To contribute, see our [Developer Guide](https://tableau.github.io/server-client-python/docs/dev-guide). A list of all our contributors to date is in [CONTRIBUTORS.md].
+To contribute, see our [Developer Guide](https://tableau.github.io/server-client-python/docs/dev-guide). A list of all our contributors to date is in [CONTRIBUTORS.md](CONTRIBUTORS.md).
 
 ## License
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