Uproot

Purely a touch-up to the PyPI page.

Try to fix PyPI page rendering and also fix another test warning (unclosed file).

Fix a Python 3.7 warning (`collections` vs `collections.abc`) and do a first full test of the new testing/deployment system.

Updated dependence to awkward 0.8.0 and uproot-methods 0.4.0. Since one can now use `awkward.JaggedArray` or `awkward.numba.JaggedArray`, all of the array-fetching functions now have an `awkwardlib` parameter where you can specify `awkwardlib="awkward.numba"` (as a string or a module object).

When `awkward.cuda` exists, this will be the mechanism for reading data directly from ROOT files onto GPUs with [CuPy](https://cupy.chainer.org).

Remove README from data_files

Fixed some (erroneous) `Interpretation` identifiers. Minimum version required for [uproot-skyhook](https://github.com/diana-hep/uproot-skyhook).

Added `reportpath` and `reportfile` parameters to `uproot.iterate`.