bitbake: bitbake: update LICENSE file with QUnit details

QUnit is now included in Toaster's test suite and distributed
with its source code.

(Bitbake rev: 540c0c8d6aeec5391aa4f76614db6905afabba2c)

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/LICENSE

@@ -8,3 +8,5 @@ Foundation and individual contributors.
 * Twitter Bootstrap (including Glyphicons), redistributed under the Apache License 2.0.
 
 * jQuery is redistributed under the MIT license.
+
+* QUnit is redistributed under the MIT license.