Update Travis badge to master branch (#258)
Update Travis badge to master branch (#258)

Signed-off-by: Kevin Petit <9b79a2d3df4408bbf6fcf0c9904434a8637f93cf@arm.com>
KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS