Add linting to tests

tox.ini

@@ -3,7 +3,10 @@
 # test suite on all supported python versions. To use it, "pip install tox"
 # and then run "tox" from this directory.
 
-[pep8]
+[tox]
+envlist = py27,py36
+
+[pycodestyle]
 ignore = E226
 max-line-length = 120
 
@@ -13,11 +16,11 @@ addopts =
     --cov-report html --cov-report term --junitxml=pytest.xml
     --cov pyls --cov test
 
-[tox]
-envlist = py27,py36
-
 [testenv]
-commands = py.test
+commands =
+    pycodestyle pyls
+    pyflakes pyls
+    py.test
 deps =
     pytest
     coverage