speed up azure jobs

Committed via https://github.com/asottile/all-repos

azure-pipelines.yml

@@ -13,6 +13,7 @@ resources:
       ref: refs/tags/v0.0.4
 
 jobs:
+- template: job--pre-commit.yml@asottile
 - template: job--python-tox.yml@asottile
   parameters:
     toxenvs: [py27, py37]

tox.ini

 [tox]
-project = add-trailing-comma
-# These should match the travis env list
-envlist = py27,py35,py36,pypy
+envlist = py27,py36,py37,pypy,pypy3,pre-commit
 
 [testenv]
 deps = -rrequirements-dev.txt
@@ -9,12 +7,12 @@ commands =
     coverage erase
     coverage run -m pytest {posargs:tests}
     coverage report --fail-under 100
-    pre-commit install -f --install-hooks
-    pre-commit run --all-files
+    pre-commit install
 
-[testenv:venv]
-envdir = venv-{[tox]project}
-commands =
+[testenv:pre-commit]
+skip_install = true
+deps = pre-commit
+commands = pre-commit run --all-files --show-diff-on-failure
 
 [pep8]
 ignore = E265,E501,W504