merchants: add 'evonax' to list of exchanges

_data/merchants.yml

@@ -39,6 +39,8 @@
       url: http://www.exchanged.i2p/en/home
     - name: Evercoin
       url: https://evercoin.com
+    - name: Evonax
+      url: https://www.evonax.com/
     - name: EXMO - USD/XMR
       url: https://exmo.com/
     - name: Godex