* Removed the instructions of tox testing * Deleted tox.ini * removed tox from requirements * removed tox from setup.cfg * removed tox from the Makefile * removed tox from contributing docs * updated the CHANGELOG * removed tox from .gitignore
#128
#488 #840 #895
* reflect Python 3.7 release * fix `pycodestyle` errors * update `pycodestyle` config * move `pytest` and `pycodestyle` config to `setup.cfg` * add `make pycodestyle` * add `make coveralls` * etc.