Show version string

|version| was substituted into the main document title, but version=
was never set; the default was empty.

docs/conf.py

@@ -15,6 +15,7 @@
 import os
 import sys
 import pathlib
+import subprocess
 
 sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
 sys.path.append(str(pathlib.Path(__file__).parent / "_ext"))
@@ -34,7 +35,7 @@
 author = 'Jeff Epler'
 
 # The full version, including alpha/beta/rc tags
-release = '1.1.0'
+version = release = subprocess.check_output(["python", "-m", "setuptools_scm"], cwd="..", encoding="ascii").strip()
 
 
 # -- General configuration ---------------------------------------------------

requirements-dev.txt

@@ -7,6 +7,7 @@ coverage
 mypy; implementation_name=="cpython"
 pre-commit
 setuptools>=45
+setuptools_scm[toml]>=6.0
 sphinx
 sphinx-autodoc-typehints
 sphinx-rtd-theme