Update tests/samples/Event.root with extra branch
Update tests/samples/Event.root with extra branch

The updated tree includes a new subbranch in extended Track branch.
See 3fecffe99380dcfb51c28f5f3bb5863bf1c019c2

The file is generated with:

    cd uproot/
    root -l -b -q 'tests/samples/MainEvent.C("tests/samples/Event.root", 1000, 1, 99, 1, 600)'

scikit-hep/uproot,scikit-hep/uproot,scikit-hep/uproot,scikit-hep/uproot