Add the setuptools-scm versioning scheme.

Author: Ryan Whitmore

pyproject.toml

@@ -37,3 +37,7 @@ test = ["pytest"]
 [tool.setuptools.packages.find]
 include = ["cons*"]
 exclude = ["tests*"]
+
+[tool.setuptools_scm]
+version_scheme = "guess-next-dev"
+local_scheme = "dirty-tag"