Update conf.py

fix #26

Update conf.py

Revert "Update conf.py"

This reverts commit a734e3fed3070f1d4a5b2ed3987a5e13ee2468b3.

Revert "Revert "Update conf.py""

This reverts commit 5c1425a58ecc5888aa4bc54f9f49abfec4036d8e.