Update README.md

- Fix Jenkin's build status URL for indigo

README.md

@@ -1,6 +1,6 @@
 # ardrone_autonomy : A ROS Driver for ARDrone 1.0 & 2.0
 
-[![](http://jenkins.ros.org/buildStatus/icon?job=devel-hydro-ardrone_autonomy)](http://jenkins.ros.org/job/devel-hydro-ardrone_autonomy)
+[![](http://jenkins.ros.org/buildStatus/icon?job=devel-indigo-ardrone_autonomy)](http://jenkins.ros.org/job/devel-indigo-ardrone_autonomy)
 
 ardrone_autonomy is a [ROS](http://ros.org/ "Robot Operating System") driver for [Parrot AR-Drone](http://ardrone2.parrot.com/) quadrocopter. This driver is based on official [AR-Drone SDK](https://projects.ardrone.org/) version 2.0.1. The driver supports both AR-Drone 1.0 and 2.0. "ardrone_autonomy" is a fork of [AR-Drone Brown](http://code.google.com/p/brown-ros-pkg/wiki/ardrone_brown) driver. This package has been developed in [Autonomy Lab](http://autonomy.cs.sfu.ca) of [Simon Fraser University](http://www.sfu.ca) by [Mani Monajjemi](http://sfu.ca/~mmonajje) ( +other [contributors](#contributors)).