Fix workflow badge (#52)

* Update README.md

Author: MaximilianAlgehed

README.md

@@ -1,7 +1,7 @@
 # quickcheck-dynamic
 
 <div align="center">
-  <a href='https://github.com/input-output-hk/quickcheck-dynamic/actions'><img src="https://img.shields.io/github/workflow/status/input-output-hk/hydra-poc/CI" /></a>&nbsp;
+  <a href='https://github.com/input-output-hk/quickcheck-dynamic/actions'><img src="https://img.shields.io/github/actions/workflow/status/input-output-hk/quickcheck-dynamic/ci.yaml" /></a>&nbsp;
   <a href='https://hackage.haskell.org/package/quickcheck-dynamic/'><img src="https://img.shields.io/hackage/v/quickcheck-dynamic" /></a>
 </div>