feat: add tx hash retrieval in wallet plugin

lib/plugins/wallet/dashd/dashd.js

@@ -125,11 +125,19 @@ function checkBlockchainStatus (cryptoCode) {
     .then(res => !!res['initialblockdownload'] ? 'syncing' : 'ready')
 }
 
+function getTxHashesByAddress (cryptoCode, address) {
+  checkCryptoCode(cryptoCode)
+    .then(() => fetch('listreceivedbyaddress', [0, true, true, true, address]))
+    .then(txsByAddress => Promise.all(_.forEach(id => fetch('getrawtransaction', [id]), _.head(txsByAddress).txids)))
+    .then(_.map(({ hash }) => hash))
+}
+
 module.exports = {
   balance,
   sendCoins,
   newAddress,
   getStatus,
   newFunding,
-  checkBlockchainStatus
+  checkBlockchainStatus,
+  getTxHashesByAddress
 }