Fix Read The Docs build (#581)

Author: adamchainz

docs/conf.py

@@ -29,10 +29,10 @@
 # version is used.
 sys.path.insert(0, project_root)
 
-from django.conf import settings
+from django.conf import settings  # noqa
 settings.configure()
 
-import django_mysql
+import django_mysql  # noqa
 
 # -- General configuration ---------------------------------------------
 
@@ -68,9 +68,19 @@
 # the built documents.
 #
 # The short X.Y version.
-version = django_mysql.__version__
+
+
+def _get_version():
+    with open(os.path.join(project_root, 'setup.cfg'), 'r') as setup_fp:
+        version_lines = [line.strip() for line in setup_fp if line.startswith("version = ")]
+
+    assert len(version_lines) == 1
+    return version_lines[0].split(' = ')[1]
+
+
+version = _get_version()
 # The full version, including alpha/beta/rc tags.
-release = django_mysql.__version__
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.