Add pre-commit hooks

.pre-commit-config.yaml

@@ -0,0 +1,26 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/psf/black
+    rev: 21.11b1
+    hooks:
+      - id: black
+        name: Black
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+        name: isort
+  - repo: https://github.com/markdownlint/markdownlint
+    rev: v0.11.0
+    hooks:
+      - id: markdownlint
+        name: Markdownlint
+        description: Run markdownlint on your Markdown files
+        entry: mdl
+        language: ruby
+        files: \.(md|mdown|markdown)$

CHANGELOG.md

@@ -1,15 +1,19 @@
-# v1.0.3
+# Changelog
+
+## v1.0.3
 
 - Increased the frequency of authentication token refreshes
+- Added pre-commit hooks config
 
-# v1.0.2
+## v1.0.2
 
 - Added support for the `--latest-day` option
 
-# v1.0.1
+## v1.0.1
 
-- Fixed a bug where the `--earliest-day` option wasn't optional, but should have been
+- Fixed a bug where the `--earliest-day` option wasn't optional,
+  but should have been
 
-# v1.0.0
+## v1.0.0
 
 - Initial release