added mercedes-benz.io to adopters.md
- [Kurio](https://kurio.id)
- [LeadIQ](https://leadiq.com)
- [MattePaint](https://www.mattepaint.com/)
+- [MercedesBenz.io](https://www.mercedes-benz.io/)
- [Mulligan Funding](https://www.mulliganfunding.com/)
- [National Information Solutions Cooperative (NISC)](https://nisc.coop/)
- [Nordstrom](https://nordstrom.com/)
