message: add HBO Max to adopters list
diff: | [Livspace](https://www.livspace.com) | [Praveen Kumar](https://github.com/praveen-livspace) | Developer portal, service catalog, tech docs, API docs and plugins |
  | [Just Eat Takeaway](https://www.justeattakeaway.com) | [Kim Wilson](https://github.com/kwilson541) | Our developer portal which centralises applications, reduces cognitive load and provides teams insights. |
  | [Hopin](https://hopin.com) | [Vladimir Glafirov](https://github.com/vglafirov), [Chloe Lee](https://github.com/msfuko) | Developer portal to streamline the development practices. Integrated with service catalog, software templates, application monitoring, tech docs and plugins. |
  +| [HBO Max](https://hbomax.com) | [@mdb](https://github.com/mdb), [@nesta219](https://github.com/nesta219), [@nmische](https://github.com/nmische), [@hbomark](https://github.com/hbomark) | Developer portal hosting service catalog and API documentation, as well as cloud infrastructure details, operational visibility tools, and a custom plugin for browsing notable platform change events, such as deployments and configuration updates. |
  