Use pre-commit from pypi.

requirements-dev.txt

diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9051674..42ddf61 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,4 +5,4 @@
 mock
 pylint
 pytest
-git+git://github.com/pre-commit/pre-commit#egg=pre_commit
+pre-commit