docs: remove duplicate a tag from readme

Signed-off-by: Michael Beemer <[email protected]>

Author: beeme1mr

README.md

@@ -20,7 +20,6 @@
   <a href="https://github.com/open-feature/dotnet-sdk/releases/tag/v1.3.1">
     <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.3.1&color=blue&style=for-the-badge" />
   </a>
-  </a>
   <!-- x-release-please-end -->
   <br/>
   <a href="https://cloud-native.slack.com/archives/C0344AANLA1">