point badge to v2 build (#1265)

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

README.md

@@ -13,7 +13,7 @@ kubectl delete -f https://github.com/kedacore/keda/releases/download/v2.0.0-rc/k
 <p align="center"><img src="images/logos/keda-word-colour.png" width="300"/></p>
 <p style="font-size: 25px" align="center"><b>Kubernetes-based Event Driven Autoscaling</b></p>
 <p style="font-size: 25px" align="center">
-<a href="https://github.com/kedacore/keda/actions"><img src="https://github.com/kedacore/keda/workflows/master%20build/badge.svg" alt="master build"></a>
+<a href="https://github.com/kedacore/keda/actions"><img src="https://github.com/kedacore/keda/workflows/v2%20build/badge.svg" alt="v2 build"></a>
 <a href="https://github.com/kedacore/keda/actions"><img src="https://github.com/kedacore/keda/workflows/nightly%20e2e%20test/badge.svg" alt="nightly e2e"></a>
 <a href="https://bestpractices.coreinfrastructure.org/projects/3791"><img src="https://bestpractices.coreinfrastructure.org/projects/3791/badge"></a>
 <a href="https://twitter.com/kedaorg"><img src="https://img.shields.io/twitter/follow/kedaorg?style=social" alt="Twitter"></a></p>