Mark test envs only by version

.travis.yml

@@ -3,9 +3,9 @@ language: python
 matrix:
   include:
     - python: 3.6
-      env: TOXENV=py36-test
+      env: TOXENV=py36
     - python: 3.7
-      env: TOXENV=py37-test
+      env: TOXENV=py37
     - python: 3.7
       env: TOXENV=lint
     - python: 3.7

CONTRIBUTING.rst

@@ -1,20 +1,16 @@
 Get started
 -----------
 
-Install `Tox`_ with:
+Install `Tox`_.
 
 .. _tox: http://tox.readthedocs.io/
 
-.. code-block:: bash
-
-    $ pip install --user tox
-
 Run tests
 ---------
 
 .. code-block:: bash
 
-    tox -e test
+    tox -e py37
 
 Lint source
 -----------

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    {py36,py37}-test
+    {py36,py37}
     lint
     sort
     format