Add Docker Hub pull count to README (#212)

Signed-off-by: John Starich <[email protected]>

README.md

@@ -1,6 +1,7 @@
 [![Build Status](https://travis-ci.com/IBM/cloud-operators.svg?branch=master)](https://travis-ci.com/IBM/cloud-operators)
 [![Go Report Card](https://goreportcard.com/badge/github.com/IBM/cloud-operators)](https://goreportcard.com/report/github.com/IBM/cloud-operators)
 [![codecov.io](https://codecov.io/github/IBM/cloud-operators/coverage.svg?branch=master)](https://codecov.io/github/IBM/cloud-operators?branch=master)
+![Docker Pulls](https://img.shields.io/docker/pulls/cloudoperators/ibmcloud-operator)
 [![GoDoc](https://godoc.org/github.com/IBM/cloud-operators?status.svg)](https://godoc.org/github.com/IBM/cloud-operators)
 
 # IBM Cloud Operator