update faucet url

Author: weilu

test/integration/utils.js

@@ -1,7 +1,7 @@
 var https = require('https')
 
 function faucetWithdraw(address, amount, done) {
-  var url = "https://coconut-macaroon.herokuapp.com/bitcoin/testnet/withdrawal?address=" + address + "&amount=" + amount
+  var url = "https://coconut-macaroon.herokuapp.com/withdrawal?address=" + address + "&amount=" + amount
   https.get(url, function(res) {
     res.statusCode == 200 ? done(null) : done(new Error("non-200 status: " + res.statusCode))
   }).on('error', done)