Fix link in CONTRIBUTING.md

Fix broken link to LICENSE in CONTRIBUTING.md

Signed-off-by: Winford <[email protected]>

Author: UncleGrumpy

CONTRIBUTING.md

@@ -9,7 +9,7 @@
 Before contributing, please read carefully our [Code of Conduct](CODE_OF_CONDUCT.md) and
 the following contribution guidelines.
 
-Please, also make sure to understand the [Apache 2.0 license](LICENSE.md) and the
+Please, also make sure to understand the [Apache 2.0 license](LICENSE) and the
 [Developer Certificate of Origin](https://developercertificate.org/).
 
 Last but not least, **do not use GitHub issues for vulnerability reports**, read instead the