Update bignumber.js to 2.4.0

Author: dougwilson

Changes.md

@@ -4,6 +4,10 @@ This file is a manually maintained list of changes for each release. Feel free
 to add your changes here when sending pull requests. Also send corrections if
 you spot any mistakes.
 
+## HEAD
+
+* Update `bignumber.js` to 2.4.0
+
 ## v2.11.1 (2016-06-07)
 
 * Fix writing truncated packets starting with large string/buffer #1438

package.json

@@ -12,7 +12,7 @@
   ],
   "repository": "mysqljs/mysql",
   "dependencies": {
-    "bignumber.js": "2.3.0",
+    "bignumber.js": "2.4.0",
     "readable-stream": "1.1.14",
     "sqlstring": "2.0.1"
   },