Updating ADOPTERS.md to include M1 Finance
Adopters did not include M1 Finance.
Add M1 Finance to ADOPTERS.md
Once Merged, Check
Fixes #N/A
- [Kairos](https://kairos.com)
- [Kurio](https://kurio.id)
- [LeadIQ](https://leadiq.com)
+- [M1 Finance](https://www.m1finance.com/)
- [MattePaint](https://www.mattepaint.com/)
- [MercedesBenz.io](https://www.mercedes-benz.io/)
- [Mulligan Funding](https://www.mulliganfunding.com/)
