From 44e23f1ffd375440396c6cfb280bc0890a2946d7 Mon Sep 17 00:00:00 2001
From: lee <lee@leedeMacBook-Pro.local>
Date: Thu, 11 Aug 2016 11:14:28 +0800
Subject: [PATCH] fix typeError of message

---
 index.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 09522ca..7ac4e0e 100644
--- a/index.js
+++ b/index.js
@@ -18,7 +18,8 @@ var optionsBuilder = function () {
 
   return {
     withMessage: function(m) {
-      message = m;
+      m = m || ''
+      message = typeof m !== 'string'?m.toString():m;
       return this;
     },