remove async-generator dependency

Author: belm0

requirements-dev.txt

@@ -9,9 +9,7 @@ alabaster==0.7.13
 astroid==2.15.0
     # via pylint
 async-generator==1.10
-    # via
-    #   trio
-    #   trio-websocket (setup.py)
+    # via trio
 attrs==22.2.0
     # via
     #   -r requirements-dev.in

requirements-min.txt

@@ -5,9 +5,7 @@
 #    pip-compile --output-file=requirements-min.txt requirements-dev.in setup.py
 #
 async-generator==1.10
-    # via
-    #   trio
-    #   trio-websocket (setup.py)
+    # via trio
 attrs==22.2.0
     # via
     #   -r requirements-dev.in

setup.py

@@ -40,7 +40,6 @@
     keywords='websocket client server trio',
     packages=find_packages(exclude=['docs', 'examples', 'tests']),
     install_requires=[
-        'async_generator>=1.10',
         'trio>=0.11',
         'wsproto>=0.14',
     ],

trio_websocket/_impl.py

@@ -1,5 +1,6 @@
 import sys
 from collections import OrderedDict
+from contextlib import asynccontextmanager
 from functools import partial
 from ipaddress import ip_address
 import itertools
@@ -10,7 +11,6 @@
 import urllib.parse
 from typing import List
 
-from async_generator import asynccontextmanager
 import trio
 import trio.abc
 from wsproto import ConnectionType, WSConnection