Merge pull request #1562 from saschagrunert/version

Update README.md version to v1.31.0

Author: k8s-ci-robot

README.md

@@ -59,7 +59,7 @@ milestones.
 ### Install crictl
 
 ```sh
-VERSION="v1.30.0"
+VERSION="v1.31.0"
 wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/crictl-$VERSION-linux-amd64.tar.gz
 sudo tar zxvf crictl-$VERSION-linux-amd64.tar.gz -C /usr/local/bin
 rm -f crictl-$VERSION-linux-amd64.tar.gz
@@ -68,7 +68,7 @@ rm -f crictl-$VERSION-linux-amd64.tar.gz
 ### Install critest
 
 ```sh
-VERSION="v1.30.0"
+VERSION="v1.31.0"
 wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/critest-$VERSION-linux-amd64.tar.gz
 sudo tar zxvf critest-$VERSION-linux-amd64.tar.gz -C /usr/local/bin
 rm -f critest-$VERSION-linux-amd64.tar.gz