add testling badge

package.json

@@ -24,6 +24,19 @@
         "quote",
         "parse"
     ],
+    "testling": {
+        "files": "test/*.js",
+        "browsers": [
+            "ie/6..latest",
+            "firefox/3.5", "firefox/15..latest", "firefox/nightly",
+            "chrome/25..latest", "chrome/canary",
+            "opera/10..latest", "opera/next",
+            "safari/5.1..latest",
+            "ipad/6.0..latest",
+            "iphone/6.0..latest",
+            "android-browser/4.2..latest"
+        ]
+    },
     "author" : {
         "name" : "James Halliday",
         "email" : "[email protected]",

readme.markdown

@@ -4,6 +4,8 @@ Parse and quote shell commands.
 
 [![build status](https://secure.travis-ci.org/substack/node-shell-quote.png)](http://travis-ci.org/substack/node-shell-quote)
 
+[![browser support](https://ci.testling.com/substack/node-shell-quote.png)](https://ci.testling.com/substack/node-shell-quote)
+
 # example
 
 ## quote