Index: frontend/node_modules/mz/readline.js
===================================================================
--- frontend/node_modules/mz/readline.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/mz/readline.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,64 @@
+var readline = require('readline')
+var Promise = require('any-promise')
+var objectAssign = require('object-assign')
+var Interface = readline.Interface
+
+function wrapCompleter (completer) {
+  if (completer.length === 2) return completer
+
+  return function (line, cb) {
+    var result = completer(line)
+
+    if (typeof result.then !== 'function') {
+      return cb(null, result)
+    }
+
+    result.catch(cb).then(function (result) {
+      process.nextTick(function () { cb(null, result) })
+    })
+  }
+}
+
+function InterfaceAsPromised (input, output, completer, terminal) {
+  if (arguments.length === 1) {
+    var options = input
+
+    if (typeof options.completer === 'function') {
+      options = objectAssign({}, options, {
+        completer: wrapCompleter(options.completer)
+      })
+    }
+
+    Interface.call(this, options)
+  } else {
+    if (typeof completer === 'function') {
+      completer = wrapCompleter(completer)
+    }
+
+    Interface.call(this, input, output, completer, terminal)
+  }
+}
+
+InterfaceAsPromised.prototype = Object.create(Interface.prototype)
+
+InterfaceAsPromised.prototype.question = function (question, callback) {
+  if (typeof callback === 'function') {
+    return Interface.prototype.question.call(this, question, callback)
+  }
+
+  var self = this
+  return new Promise(function (resolve) {
+    Interface.prototype.question.call(self, question, resolve)
+  })
+}
+
+objectAssign(exports, readline, {
+  Interface: InterfaceAsPromised,
+  createInterface: function (input, output, completer, terminal) {
+    if (arguments.length === 1) {
+      return new InterfaceAsPromised(input)
+    }
+
+    return new InterfaceAsPromised(input, output, completer, terminal)
+  }
+})