docs: Use autodoc_default_options

Author: jpmckinney

agate/data_types/date.py

@@ -56,8 +56,7 @@ def cast(self, d):
         If both `date_format` and `locale` have been specified
         in the `agate.Date` instance, the `cast()` function
         is not thread-safe.
-        :returns:
-            :class:`datetime.date` or :code:`None`.
+        :returns: :class:`datetime.date` or :code:`None`.
         """
         if type(d) is date or d is None:
             return d

agate/data_types/date_time.py

@@ -63,8 +63,7 @@ def cast(self, d):
         If both `date_format` and `locale` have been specified
         in the `agate.DateTime` instance, the `cast()` function
         is not thread-safe.
-        :returns:
-            :class:`datetime.datetime` or :code:`None`.
+        :returns: :class:`datetime.datetime` or :code:`None`.
         """
         if isinstance(d, datetime.datetime) or d is None:
             return d

docs/conf.py

@@ -34,7 +34,10 @@
 
 htmlhelp_basename = 'agatedoc'
 
-autodoc_default_flags = ['members', 'show-inheritance']
+autodoc_default_options = {
+    'members': None,
+    'show-inheritance': True,
+}
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3', None),