(libT) update our jsonsl snapshot

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13819 f4695dd4-2c0a-0410-b89c-da849a56a58e
bump NEWS

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13820 f4695dd4-2c0a-0410-b89c-da849a56a58e