Don't bother with flake8 tests, now that we're using black.

.travis.yml

@@ -11,14 +11,6 @@ install:
 
 jobs:
   include:
-    - python: 2.7
-      stage: lint
-      script: tox -e flake8
-
-    - python: 3.4
-      stage: lint
-      script: tox -e flake8
-
     - python: 2.7
       stage: test
       script: tox -e py27

tox.ini

 [tox]
-envlist = py27,py3{4,5,6},flake8
+envlist = py27,py3{4,5,6}
 
 [testenv]
 deps =
     -rrequirements.txt
-    flake8
     pytest
     mock
 setenv =
@@ -14,8 +13,3 @@ whitelist_externals =
 commands =
     make schema
     py.test
-
-[testenv:flake8]
-commands =
-    make schema
-    flake8 pi_mqtt_gpio