📝 added link to docker hub on pull badge (#13)

Author: bgauduch

README.md

@@ -1,6 +1,6 @@
 [![Docker Build Status](https://img.shields.io/docker/cloud/build/zenika/terraform-azure-cli.svg)](https://hub.docker.com/r/zenika/terraform-azure-cli/)
 [![](https://images.microbadger.com/badges/image/zenika/terraform-azure-cli.svg)](https://microbadger.com/images/zenika/terraform-azure-cli)
-![Docker Pulls](https://img.shields.io/docker/pulls/zenika/terraform-azure-cli.svg)
+[![Docker Pulls](https://img.shields.io/docker/pulls/zenika/terraform-azure-cli.svg)](https://hub.docker.com/r/zenika/terraform-azure-cli/)
 
 # Terraform and Azure CLI Docker image
 Docker Image including Azure and Terraform CLI tools.