Add pre-release and release workflows

Author: thesmallstar

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "slackify_markdown"
-version = "0.1.2"
+version = "0.1.3"
 description = "Convert markdown to Slack-compatible formatting"
 readme = "README.md"
 authors = [