add ChangeHero to the list of exchanges

_data/merchants.yml

@@ -15,6 +15,8 @@
       url: https://www.bittrex.com/Market/Index?MarketName=BTC-XMR
     - name: Bter
       url: https://bter.com/
+    - name: ChangeHero - Instant exchange
+      url: https://changehero.io/
     - name: ChangeNOW
       url: https://changenow.io
     - name: CoinCut (OTC)