docs: add reference users to readme (#1480)

readme.md

@@ -20,6 +20,18 @@ Automated dependency updates. Flexible, so you don't need to be.
 * Supports GitHub, GitLab (APIv4) and VSTS. BitBucket is a WIP.
 * Open source (installable via npm/yarn) so can be self-hosted or used for free via GitHub App
 
+## Who Uses Renovate?
+
+Renovate was released in 2017 and is now widely used in the developer community. Example users include the following GitHub organisations:
+
+[<img align="left" src="https://avatars1.githubusercontent.com/u/2034458?s=80&v=4" alt="algolia" title="algolia" hspace="10"/>](https://github.com/algolia)
+[<img align="left" src="https://avatars0.githubusercontent.com/u/139426?s=80&v=4" alt="angular" title="angular" hspace="10"/>](https://github.com/angular)
+[<img align="left" src="https://avatars2.githubusercontent.com/u/131524?s=80&v=4" alt="mozilla" title="mozilla" hspace="10"/>](https://github.com/mozilla)
+[<img align="left" src="https://avatars2.githubusercontent.com/u/33676472?s=80&v=4" alt="uber-workflow" title="uber-workflow" hspace="10"/>](https://github.com/uber-workflow)
+[<img align="left" src="https://avatars1.githubusercontent.com/u/22247014?s=80&v=4" alt="yarnpkg" title="yarnpkg" hspace="10"/>](https://github.com/yarnpkg)
+
+<br /><br /><br /><br /><br />
+
 ## The Renovate Approach
 
 * Everyone can benefit from automation, whether it's a little or a lot