Run flake for each test environment

tox.ini

@@ -1,27 +1,25 @@
 [tox]
 envlist =
     py36
-    flake
 
 [travis]
 python =
-    3.6: py36, flake
+    3.6: py36
 
 [testenv]
-commands = py.test
+commands =
+    py.test
+    flake8 fimfarchive tests
 deps =
     -rrequirements.txt
     pytest
+    flake8
 
 [pytest]
 addopts =
     --ignore venv
     --ignore tests/test_fetchers.py
 
-[testenv:flake]
-commands = flake8 fimfarchive tests
-deps = flake8
-
 [flake8]
 filenames = *.py
 exclude = fimfarchive/__init__.py