Update docs

README.md

@@ -76,6 +76,24 @@ Default value: `undefined`
 - When `infile` is not set, the changelog generated by this plugin will still be used as release notes for e.g.
   [GitHub Releases](https://github.com/release-it/release-it/blob/master/docs/github-releases.md).
 
+### `header`
+
+Set the main header for the changelog document:
+
+```json
+{
+  "plugins": {
+    "@release-it/conventional-changelog": {
+      "infile": "CHANGELOG.md",
+      "header": "# Changelog",
+      "preset": {
+        "name": "conventionalcommits"
+      }
+    }
+  }
+}
+```
+
 ### `ignoreRecommendedBump`
 
 Default value: `false`
@@ -172,25 +190,25 @@ For example, you can use the following option to group the commits by 'scope' in
 }
 ```
 
-If you want to customize the templates used to write the changelog, you can do it like in a ``.release-it.js`` file like so:
+If you want to customize the templates used to write the changelog, you can do it like in a `.release-it.js` file like
+so:
 
 ```js
-const fs = require("fs");
+const fs = require('fs');
 
-const commitTemplate = fs.readFileSync("commit.hbs").toString();
+const commitTemplate = fs.readFileSync('commit.hbs').toString();
 
 module.exports = {
-    plugins: {
-        "@release-it/conventional-changelog": {
-            writerOpts: {
-                commitPartial: commitTemplate,
-            },
-        },
-    },
+  plugins: {
+    '@release-it/conventional-changelog': {
+      writerOpts: {
+        commitPartial: commitTemplate
+      }
+    }
+  }
 };
 ```
 
-
 ## GitHub Actions
 
 When using this plugin in a GitHub Action, make sure to set