Update testing instructions

README.md

@@ -131,14 +131,4 @@ repository directory:
 
     pip install -e .[test]
 
-This should install tox and pytest.
-
-Since my development environment has Python 3.5 and tox is only configured to
-test 3.5, both the `tox` and `pytest` commands have the same result. Once sbws
-gets properly open source, Travis should run tox with a variety of Python 3.X
-versions.
-
-To run the tests, run `pytest`. To generate HTML output of test coverage, run
-`pytest --cov --cov-report=html`. A `htmlcov` directory will be created in
-current working directory. Open it in a web browser and prepare to be amazed.
-It will highlight (un)covered lines! How cool is that?!
+This should install tox and pytest. Then simply run `tox`.