Update merchants.yml

added 2 explorers and 1 exchange listing

_data/merchants.yml

@@ -8,6 +8,8 @@
       url: https://www.bittrex.com/Market/Index?MarketName=BTC-XMR
     - name: Bter
       url: https://bter.com/
+    - name: Cryptopia
+      url: https://www.cryptopia.co.nz/Exchange?market=XMR_BTC
     - name: Poloniex
       url: https://poloniex.com/exchange/btc_xmr
     - name: ShapeShift (Instant)
@@ -18,6 +20,10 @@
       url: http://chainradar.com/xmr/blocks
     - name: MoneroBlocks
       url: http://moneroblocks.info
+    - name: MoneroExplorer
+      url: https://explorer.xmr.my/
+    - name: Onion Monero Blockchain Explorer
+      url: http://107.172.25.35:8081/
 - category: Libraries and Helpers
   merchants:
     - name: monero-nodejs (Node.js)