docs(bump): add information about changelog

Author: woile

docs/bump.md

@@ -54,7 +54,7 @@ Some examples:
 
 ```bash
 $ cz bump --help
-usage: cz bump [-h] [--dry-run] [--files-only] [--yes]
+usage: cz bump [-h] [--dry-run] [--files-only] [--changelog] [--yes]
                [--tag-format TAG_FORMAT] [--bump-message BUMP_MESSAGE]
                [--prerelease {alpha,beta,rc}]
                [--increment {MAJOR,MINOR,PATCH}]
@@ -63,10 +63,11 @@ optional arguments:
   -h, --help            show this help message and exit
   --dry-run             show output to stdout, no commit, no modified files
   --files-only          bump version in the files from the config
+  --changelog, -ch      generate the changelog for the newest version
   --yes                 accept automatically questions done
   --tag-format TAG_FORMAT
-                        the format used to tag the commit and read it, use it in
-                        existing projects, wrap around simple quotes
+                        the format used to tag the commit and read it, use it
+                        in existing projects, wrap around simple quotes
   --bump-message BUMP_MESSAGE
                         template used to create the release commmit, useful
                         when working with CI
@@ -78,6 +79,14 @@ optional arguments:
 
 ## Configuration
 
+### `changelog`
+
+Generate a **changelog** along with the new version and tag when bumping.
+
+```bash
+cz bump --changelog
+```
+
 ### `tag_format`
 
 It is used to read the format from the git tags, and also to generate the tags.