Update readme

Author: cblanc

README.md

@@ -4,12 +4,12 @@
 
 > Node.js client for api.ideal-postcodes.co.uk
 
-[![CircleCI](https://circleci.com/gh/ideal-postcodes/core-node/tree/master.svg?style=svg)](https://circleci.com/gh/ideal-postcodes/core-node/tree/master)
 [![codecov](https://codecov.io/gh/ideal-postcodes/core-node/branch/master/graph/badge.svg)](https://codecov.io/gh/ideal-postcodes/core-node)
 [![Dependency Status](https://david-dm.org/ideal-postcodes/core-node.svg)](https://david-dm.org/ideal-postcodes/core-node)
 [![npm version](https://badge.fury.io/js/%40ideal-postcodes%2Fcore-node.svg)](https://www.npmjs.com/package/@ideal-postcodes/core-node)
 [![install size](https://packagephobia.now.sh/badge?p=@ideal-postcodes/core-node)](https://packagephobia.now.sh/result?p=@ideal-postcodes/core-node)
 [![Release](https://github.com/ideal-postcodes/core-node/workflows/Release/badge.svg)](https://github.com/ideal-postcodes/core-node/actions)
+![CI](https://github.com/ideal-postcodes/core-node/workflows/CI/badge.svg)
 
 `@ideal-postcodes/core-node` is the Node.js client for api.ideal-postcodes.co.uk