updated example config to 0.4.0

Author: Cielquan

README.rst

@@ -21,7 +21,7 @@ Add this to your project's ``.pre-commit-config.yaml`` file:
 .. code-block:: yaml
 
     - repo: https://github.com/Cielquan/commit-msg-jira-hook
-      rev: v0.3.0 # Use the ref you want to point at
+      rev: v0.4.0 # Use the ref you want to point at
       hooks:
       - id: jira_commit_msg
         stages: [commit-msg]