Fix wrong docker image tag for docker4mac (#51)

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

Author: rimusz

examples/docker-for-mac/my_test.sh

@@ -18,7 +18,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-readonly IMAGE_TAG=v3.0.0
+readonly IMAGE_TAG=v2.0.0
 readonly IMAGE_REPOSITORY="quay.io/helmpack/chart-testing"
 
 main() {