Update README.md

Author: donatj

README.md

@@ -1,9 +1,11 @@
 # Quorum Array Functions
 
+[![Build Status](https://travis-ci.org/QuorumCollection/ArrayFunctions.svg?branch=master)](https://travis-ci.org/QuorumCollection/ArrayFunctions)
+
 A collection of global `array_*` functions appending to the native PHP set.
 
 - `array_flatten`
 - `array_blend`
 - `array_key_array`
 - `array_keys_array`
-- `array_key_refill`
+- `array_key_refill`