Docs: fix pre commit hook

The minimatch pattern in `package.json` was not matching anything at
all. Currently, I can't figure out how to write a minimatch supported
pattern that will "include any file from docs, but not `changelog.md`".

Luckily, `changelog.md` should only be updated by `postversion.sh`,
which doesn't have any human interaction. I've updated `postversion.sh`
to bypass the pre commit hook.

package.json

@@ -34,7 +34,7 @@
   },
   "lint-staged": {
     "*.js": "eslint",
-    "docs/!(changelog)*.md": "markdownlint"
+    "docs/**/*.md": "markdownlint"
   },
   "dependencies": {
     "diff": "^3.1.0",

scripts/postversion.sh

@@ -19,4 +19,4 @@ cp "./pkg/sinon.js" "./docs/releases/sinon-$PACKAGE_VERSION.js"
 git add "docs/releases/sinon-$PACKAGE_VERSION.js"
 git add docs/changelog.md
 git add docs/_config.yml
-git commit -m "Update docs/changelog.md and set new release id in docs/_config.yml"
+git commit -n -m "Update docs/changelog.md and set new release id in docs/_config.yml"