feat: basic support for displaying version history

this is not terribly feature-rich yet, just the basics

pyproject.toml

@@ -50,7 +50,7 @@ dependencies = [
 
 
 [project.optional-dependencies]
-continuum = ["Wutta-Continuum"]
+continuum = ["Wutta-Continuum>=0.2.1"]
 docs = ["Sphinx", "furo", "sphinxcontrib-programoutput"]
 tests = ["pylint", "pytest", "pytest-cov", "tox"]
 
@@ -91,3 +91,9 @@ update_changelog_on_bump = true
 exclude = [
   "htmlcov/",
 ]
+
+
+[tool.pytest.ini_options]
+markers = [
+        "versioned: tests with SQLAlchemy-Continuum versioning feature enabled",
+]