Fix pre-commit when python-future is installed and a py3 virtualenv is being created

pre_commit/languages/python.py

@@ -56,7 +56,7 @@ def install_environment(
     # Install a virtualenv
     with clean_path_on_failure(repo_cmd_runner.path(directory)):
         venv_cmd = [
-            sys.executable, '-m', 'virtualenv',
+            sys.executable, '-m', 'virtualenv_hax',
             '{{prefix}}{0}'.format(directory)
         ]
         if version != 'default':

requirements-dev.txt

@@ -3,6 +3,8 @@
 astroid<1.3.3
 coverage
 flake8
+# To ensure py2 creating py3 virtualenv works under test
+future
 mock
 pylint<1.4
 pytest

setup.py

@@ -46,7 +46,7 @@ setup(
         'ordereddict',
         'pyyaml',
         'simplejson',
-        'virtualenv',
+        'virtualenv-hax',
     ],
     entry_points={
         'console_scripts': [