use rtd-compatible body selector for versionwarning

docs/conf.py

@@ -101,3 +101,7 @@ versionwarning_messages = {
                'For the documentation of the first beta of the 0.8 release see '
                'https://docs.stackspin.net/en/v0.8beta1/')
 }
+
+# User rtd-theme compatible selector
+# see https://github.com/humitos/sphinx-version-warning/issues/25
+versionwarning_body_selector = 'div[itemprop="articleBody"]'