add merchant 'zeoagency'

_data/merchants.yml

@@ -244,6 +244,8 @@
       url: https://Whattheserver.me
     - name: XMR.to Monero to Bitcoin Payment Service
       url: https://xmr.to/
+    - name: Zeo Agency - SEO consultancy
+      url: https://zeo.org/
 - category: Goods
   id: goods
   merchants: