Code update for 2.8.15 fails in Python 3 for ALICE files (too large to include as unit tests). This fixes it.
2.8.15
Skip reading TTree.fUserInfo and TTree.fBranchRef for ALICE.
2.8.14
Remove Bokeh and Holoviews viewers for histograms (cruft: we'll probably use Vega or go indirectly through pandhist; definitely don't want BokehCanvas, which is a buggy version of [VegaScope](https://github.com/diana-hep/vegascope)).
2.8.13
Fixed bug 70, allowing empty ROOT files to be opened without raising exceptions.
2.8.12
Added Windows to continuous integration with [AppVeyor](https://ci.appveyor.com/project/jpivarski/uproot) and fixed an error with loading histograms.