update README.dev.md for generated package

Author: f-hafner

{{cookiecutter.directory_name}}/README.dev.md

@@ -116,9 +116,9 @@ make doctest
 Bumping the version across all files is done with [bump-my-version](https://github.com/callowayproject/bump-my-version), e.g.
 
 ```shell
-bump-my-version major  # bumps from e.g. 0.3.2 to 1.0.0
-bump-my-version minor  # bumps from e.g. 0.3.2 to 0.4.0
-bump-my-version patch  # bumps from e.g. 0.3.2 to 0.3.3
+bump-my-version bump major  # bumps from e.g. 0.3.2 to 1.0.0
+bump-my-version bump minor  # bumps from e.g. 0.3.2 to 0.4.0
+bump-my-version bump patch  # bumps from e.g. 0.3.2 to 0.3.3
 ```
 
 ## Making a release