Remove contain_subset as it is not used any more

Author: Cito

docs/modules/pyutils.rst

@@ -6,9 +6,8 @@ PyUtils
 .. autofunction:: camel_to_snake
 .. autofunction:: snake_to_camel
 .. autofunction:: cached_property
-.. autofunction:: contain_subset
 .. autofunction:: dedent
-.. autoclass::  EventEmitter
+.. autoclass:: EventEmitter
 .. autoclass:: EventEmitterAsyncIterator
 .. autofunction:: is_finite
 .. autofunction:: is_integer

graphql/pyutils/__init__.py

@@ -10,7 +10,6 @@
 
 from .convert_case import camel_to_snake, snake_to_camel
 from .cached_property import cached_property
-from .contain_subset import contain_subset
 from .dedent import dedent
 from .event_emitter import EventEmitter, EventEmitterAsyncIterator
 from .inspect import inspect
@@ -27,7 +26,6 @@
     "camel_to_snake",
     "snake_to_camel",
     "cached_property",
-    "contain_subset",
     "dedent",
     "EventEmitter",
     "EventEmitterAsyncIterator",