do not require specific sphinx version

Author: JorjMcKie

docs/conf.py

@@ -12,7 +12,7 @@
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-needs_sphinx = "2.0"
+# needs_sphinx = "2.0"
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom