Add note about not writing a changelog and setting options from CLI (c…

…loses #48)

README.md

@@ -75,6 +75,7 @@ Default value: `undefined`
   history.
 - 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).
+- Set `infile: false` to disable the changelog writing (and only use the recommended bump for the next version).
 
 ### `header`
 
@@ -209,6 +210,21 @@ module.exports = {
 };
 ```
 
+## Command-line
+
+Options for this plugin can be set from the command line. Some examples:
+
+```
+release-it --plugins.@release-it/conventional-changelog.infile=history.md
+release-it --no-plugins.@release-it/conventional-changelog.infile
+```
+
+- Keys are separated by dots.
+- Values can be negated by prefixing the key with `no-`.
+- Arguments may need to be single-quoted (`'`) such as `--'deep.key=value'` or `'--deep.key=value'`
+
+Depending on your shell or OS this may differ.
+
 ## GitHub Actions
 
 When using this plugin in a GitHub Action, make sure to set