message: docs: add wealthsimple to adopters list
diff: | Organization | Contact | Description of Use |
  -| --------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ |
  +| -------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ |
  | [Spotify](https://www.spotify.com) | [@stefanalund](https://github.com/stefanalund) | Main interface towards all of Spotify's infrastructure and technical documentation. |
  | [bol.com](https://www.bol.com) | [@RoyJacobs](https://github.com/RoyJacobs) | Initial work being done to unify platform tooling. |
  | [DFDS](https://www.dfds.com) | [@carlsendk](https://github.com/carlsendk) | V2 self-service platform. |
  | [Kiwi.com](https://kiwi.com) | [@aexvir](https://github.com/aexvir) | Replacing the frontend of [The Zoo](https://github.com/kiwicom/the-zoo), their service registry. |
  | [Voi](https://www.voiscooters.com/) | [@K-Phoen](https://github.com/K-Phoen) | Developer portal, main gateway to our infrastructure, documentation and internal tooling. |
  | [Talkdesk](https://www.talkdesk.com) | [@jaime-talkdesk](https://github.com/jaime-talkdesk) | Initial work for Engineering Portal and Self Provisioning to R&D |
  +| [Wealthsimple](https://www.wealthsimple.com) | [@andrewthauer](https://github.com/andrewthauer) | Developer portal, service catalog, documentation and tooling |
  