pre-commit: add pyupgrade, run it

Author: scop

.pre-commit-config.yaml

@@ -66,6 +66,13 @@ repos:
         # Intentionally not run on helpers/python (support very old versions)
         exclude: completions/
 
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.7.1
+    hooks:
+      - id: pyupgrade
+        args: [--py3-plus, --keep-percent-format]
+        exclude: completions/
+
   - repo: https://github.com/perltidy/perltidy
     rev: "20200619"
     hooks:

extra/make-changelog.py

@@ -1,5 +1,4 @@
 #!/usr/bin/python3
-# -*- encoding: utf-8 -*-
 
 import sys
 from collections import defaultdict