Update readme with notes about tox

gyermolenko · gyermolenko · commit a6c1919e5a05 · 2019-04-06T19:51:46.000+03:00
diff --git a/README.md b/README.md
@@ -117,4 +117,6 @@ When everything else is done - update corresponding part of README.
 
 
 ##### Travis CI
-Please run `flake8` and `pytest` commands locally to be sure your changes will pass CI .
+Please run `tox` or `tox -e ci37` before submitting a patch to be sure your changes will pass CI.
+
+You can also run `flake8` or `pytest` commands manually. Examples can be found in `tox.ini`.
