add atomox to merchants list

_data/merchants.yml

@@ -109,6 +109,8 @@
   merchants:
     - name: Atesti Data Timestamping
       url: http://atesti.mooo.com:8081
+    - name: Atomox - Converter
+      url: http://atomox.net/1/XMR/USD
     - name: ForkGuard Network Monitoring
       url: http://forkguard.com
     - name: MoneroBase Price Charts and Tools