Switch from pytest-pep8 to pycodestyle.

Pytest-pep8 received the last update in 2014, and it is now not working with pytest >= 4.5

requirements-testing.txt

@@ -1,4 +1,4 @@
 mock
-pytest-pep8
 coverage<4.0a1
 pytest-cache
+pycodestyle

setup.cfg

@@ -1,3 +1,5 @@
 [wheel]
 universal = 1
 
+[pycodestyle]
+max-line-length = 120

tests/feature/test_reuse.py

@@ -21,6 +21,7 @@ def appends_1(empty_list):
     empty_list.append(1)
     return empty_list
 
+
 given('I have a fixture (appends 1 to a list) in reuse syntax', fixture='appends_1')
 
 

tox.ini

@@ -27,7 +27,7 @@ deps =
 commands = py.test tests --junitxml={envlogdir}/junit-{envname}.xml
 
 [testenv:py27-pytestlatest-linters]
-commands = {[testenv]commands} pytest_bdd --pep8 -m pep8
+commands = pycodestyle pytest_bdd tests
 
 [testenv:py27-pytestlatest-xdist]
 deps =