Added HEPTutorial (42) and an empty ROOT file (43).
0.3.7
Adds [uproot-issue510b.root](https://github.com/scikit-hep/scikit-hep-testdata/blob/master/src/skhep_testdata/data/uproot-issue510b.root) to test memberwise splitting.
0.3.6
Adds the file associated with scikit-hep/uproot513.