README.rst and CHANGES.rst are installed in wrong location

[pekkarr]

OS: Arch Linux
jaconv version: 0.3.4

• When installing jaconv as a system package, README.rst and CHANGES.rst get installed to /usr/README.rst and /usr/CHANGES.rst.
• When installing locally for the current user, the files get installed to $HOME/.local/README.rst and $HOME/.local/CHANGES.rst.

This happens with both python setup.py install and pip install.

The issue seems to be the data_files argument to setup in setup.py. This keyword is deprecated according to the documentation and removing it fixes the problem.