[pitivi] Update pre-commit hooks

[Alexandru Băluț <alexbalut src gnome org>]

commit 2373ff49822d24f8d8a41f4db2a11cf1180d7042
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue Dec 17 13:28:57 2019 +0100

    Update pre-commit hooks

 .pre-commit-config.yaml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 16030f07..88da45ed 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,10 +1,10 @@
 repos:
 -   repo: https://github.com/pre-commit/pre-commit.git
-    rev: v1.18.3
+    rev: v1.20.0
     hooks:
     -   id: validate_manifest
 -   repo: https://github.com/pre-commit/pre-commit-hooks.git
-    rev: v2.3.0
+    rev: v2.4.0
     hooks:
     # Hooks able to fix small things.
     -   id: trailing-whitespace
@@ -15,11 +15,11 @@ repos:
     -   id: check-docstring-first
     -   id: debug-statements
 -   repo: https://github.com/asottile/reorder_python_imports.git
-    rev: v1.7.0
+    rev: v1.8.0
     hooks:
     -   id: reorder-python-imports
 -   repo: https://github.com/pycqa/pydocstyle
-    rev: 4.0.1
+    rev: 5.0.1
     hooks:
     -   id: pydocstyle
         args: