fix doc generation

docs/conf.py

@@ -25,11 +25,13 @@
 
 
 def get_version():
-    black_py = CURRENT_DIR / ".." / "black.py"
-    _version_re = re.compile(r"__version__\s+=\s+(?P<version>.*)")
-    with open(str(black_py), "r", encoding="utf8") as f:
-        version = _version_re.search(f.read()).group("version")
-    return str(ast.literal_eval(version))
+    import sys
+
+    sys.path.append(str(CURRENT_DIR.parent))
+    from _version import get_versions
+
+    v = get_versions()
+    return v.get("closest-tag", v["version"])
 
 
 def make_pypi_svg(version):