fix tests type (#283)

Author: alexpantyukhin

tests/test_memcached_storage.py

@@ -181,7 +181,7 @@ async def handler(request):
     assert resp.status == 200
 
 
-async def test_create_storate_with_custom_key_factory(aiohttp_client,
+async def test_create_storage_with_custom_key_factory(aiohttp_client,
                                                       memcached):
 
     async def handler(request):

tests/test_redis_storage.py

@@ -223,7 +223,7 @@ async def handler(request):
     assert resp.status == 200
 
 
-async def test_create_storate_with_custom_key_factory(aiohttp_client, redis):
+async def test_create_storage_with_custom_key_factory(aiohttp_client, redis):
 
     async def handler(request):
         session = await get_session(request)