Revert allowing failures for flake8 checks

This partially reverts commit 4e40786.

Author: webknjaz

.travis.yml

@@ -19,14 +19,11 @@ matrix:
     # TODO: fix tests
     - python: pypy3
     - env: TOXENV=pre-commit-pep257
-    - env: TOXENV=pre-commit-flake8
   include:
     - python: 3.6
       env: TOXENV=pre-commit
     - python: 3.6
       env: TOXENV=pre-commit-pep257
-    - python: 3.6
-      env: TOXENV=pre-commit-flake8
     - python: 3.6
       env: TOXENV=dist-check
 

tox.ini

@@ -15,17 +15,13 @@ extras =
 [testenv:pre-commit]
 deps = pre-commit
 setenv =
-    SKIP=pep257,flake8
+    SKIP=pep257
 commands = pre-commit run --all-files {posargs}
 
 [testenv:pre-commit-pep257]
 deps = pre-commit
 commands = pre-commit run --all-files pep257 {posargs}
 
-[testenv:pre-commit-flake8]
-deps = pre-commit
-commands = pre-commit run --all-files flake8 {posargs}
-
 [testenv:dist-check]
 # ensure that package artifacts are installed as expected
 usedevelop = False