[docs] add min Sphinx version = 1.3
this is required to support the built-in Napoleon extension
@@ -34,7 +34,7 @@ release = ""
# If your documentation needs a minimal Sphinx version, state it here.
#
-# needs_sphinx = '1.0'
+needs_sphinx = '1.3'
# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
