Update README.md

Co-authored-by: Andriy Knysh <[email protected]>

README.md

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-<a href="https://cpco.io/homepage"><img src="https://github.com/cloudposse/build-harness/blob/main/.github/banner.png?raw=true" alt="Project Banner"/></a><br/>
+<a href="https://cpco.io/homepage"><img src="https://github.com/cloudposse/build-harness/blob/master/.github/banner.png?raw=true" alt="Project Banner"/></a><br/>
     <p align="right">
 <a href="https://github.com/cloudposse/build-harness/actions/workflows/docker.yml"><img src="https://img.shields.io/github/actions/workflow/status/cloudposse/build-harness/docker.yml?style=for-the-badge" alt="Build Status"/></a><a href="https://github.com/cloudposse/build-harness/releases/latest"><img src="https://img.shields.io/github/release/cloudposse/build-harness.svg?style=for-the-badge" alt="Latest Release"/></a><a href="https://github.com/cloudposse/build-harness/commits/master/"><img src="https://img.shields.io/github/last-commit/cloudposse/build-harness/master?style=for-the-badge" alt="Last Updated"/></a><a href="https://slack.cloudposse.com"><img src="https://slack.cloudposse.com/for-the-badge.svg" alt="Slack Community"/></a></p>
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