Add pre-commit files and linting using pre-commit

.pre-commit-config.yaml

@@ -0,0 +1,24 @@
+repos:
+-   repo: https://github.com/ambv/black
+    rev: 18.6b4
+    hooks:
+    -   id: black
+        args: [--safe, --quiet]
+        language_version: python3.6
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v1.3.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: debug-statements
+    -   id: flake8
+-   repo: local
+    hooks:
+    -   id: rst
+        name: rst
+        entry: rst-lint --encoding utf-8
+        files: ^(CHANGELOG.rst|HOWTORELEASE.rst|README.rst|changelog/.*)$
+        language: python
+        additional_dependencies: [pygments, restructuredtext_lint]
+        python_version: python3.6

.travis.yml

@@ -25,12 +25,17 @@ install: pip install tox setuptools_scm
 script: tox
 
 stages:
+- linting
 - test
 - name: deploy
   if: repo = pytest-dev/pytest-xdist AND tag IS present
 
 jobs:
   include:
+    - stage: linting
+      python: '3.6'
+      script:
+      - tox -e linting
     - stage: test
     # python x env above are already included into this stage
     - python: "2.7"

tox.ini

@@ -1,11 +1,10 @@
 [tox]
 # if you change the envlist, please update .travis.yml file as well
 envlist=
+  linting
   py{27,34,35,36}-pytest{34,35,36}
   py{27,36}-pytest36-pexpect
   py{27,36}-pytest{master,features}
-  flakes
-  readme
 
 
 [testenv]
@@ -28,16 +27,11 @@ commands=
   py.cleanup -aq
   pytest {posargs}
 
-[testenv:flakes]
+[testenv:linting]
 changedir=
-deps = flake8
-commands = flake8 setup.py testing xdist
-
-[testenv:readme]
-changedir =
-deps = readme
-skip_install = true
-commands = python setup.py check -r -s
+deps =
+  pre-commit
+commands = pre-commit run --all
 
 [testenv:release]
 changedir=