remove pytz

.isort.cfg

@@ -1,2 +1,2 @@
 [settings]
-known_third_party = aniso8601,graphql,graphql_relay,promise,pytest,pytz,pyutils,setuptools,snapshottest,sphinx_graphene_theme
+known_third_party = aniso8601,graphql,graphql_relay,promise,pytest,pyutils,setuptools,snapshottest,sphinx_graphene_theme

graphene/types/tests/test_datetime.py

@@ -1,6 +1,5 @@
 import datetime
 
-import pytz
 from graphql import GraphQLError
 import pytest
 
@@ -29,7 +28,7 @@ schema = Schema(query=Query)
 
 @pytest.fixture
 def sample_datetime():
-    utc_datetime = datetime.datetime(2019, 5, 25, 5, 30, 15, 10, pytz.utc)
+    utc_datetime = datetime.datetime(2019, 5, 25, 5, 30, 15, 10, datetime.timezone.utc)
     return utc_datetime
 
 

setup.py

@@ -56,7 +56,6 @@ tests_require = [
     "coveralls",
     "promise",
     "mock",
-    "pytz",
     "iso8601",
 ]