build: change bumpversion message to conventional commit format

Author: Apkawa

setup.cfg

@@ -3,6 +3,7 @@ current_version = 0.0.9
 commit = True
 commit_args = --no-verify
 tag = True
+message = chore: Bump version: {current_version} → {new_version}
 
 [metadata]
 description-file = README.md
@@ -20,7 +21,7 @@ universal = 1
 
 [flake8]
 ignore = D203
-exclude = 
+exclude =
 	.git/,
 	.tox/,
 	docs/,