Ran pre-commit autoupdate.

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

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 00bf908..8583030 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,7 +13,7 @@
     -   id: requirements-txt-fixer
     -   id: flake8
 -   repo: https://github.com/pre-commit/pre-commit
-    sha: v0.15.2
+    sha: v0.16.3
     hooks:
     -   id: validate_config
     -   id: validate_manifest
@@ -23,10 +23,10 @@
     -   id: reorder-python-imports
         language_version: python2.7
 -   repo: https://github.com/asottile/pyupgrade
-    sha: v1.1.3
+    sha: v1.1.4
     hooks:
     -   id: pyupgrade
 -   repo: https://github.com/asottile/add-trailing-comma
-    sha: v0.6.1
+    sha: v0.6.4
     hooks:
     -   id: add-trailing-comma