chg:docs: use generic numbers for version example

Author: nicokant

README.md

@@ -71,10 +71,10 @@ Example:
 uv run bump-my-version bump minor
 uv sync
 git add .
-git commit -m "Bump version: 0.1.0 -> 0.2.0"
-git tag v0.2.0
+git commit -m "Bump version: 0.x.0 -> 0.y.0"
+git tag v0.y.0
 uv run gitchangelog
 git add CHANGELOG.txt
 git commit --amend --no-edit
-git tag -f v0.2.0
+git tag -f v0.y.0
 ```