use latest django for python 3.8. by Giles and Filip

Author: filiplajszczak

tests/test_django_project.py

@@ -287,7 +287,7 @@ def test_actually_produces_wsgi_file_that_can_import_project_non_nested(
         running_python_version = ".".join(python_version().split(".")[:2])
         project = DjangoProject("mydomain.com", running_python_version)
         shutil.copytree(str(non_nested_submodule), str(project.project_path))
-        if running_python_version == "3.7":
+        if running_python_version in ["3.7", "3.8"]:
             project.create_virtualenv(django_version="latest")
         else:
             project.create_virtualenv()
@@ -306,7 +306,7 @@ def test_actually_produces_wsgi_file_that_can_import_nested_project(
         running_python_version = ".".join(python_version().split(".")[:2])
         project = DjangoProject("mydomain.com", running_python_version)
         shutil.copytree(str(more_nested_submodule), str(project.project_path))
-        if running_python_version == "3.7":
+        if running_python_version in ["3.7", "3.8"]:
             project.create_virtualenv(django_version="latest")
         else:
             project.create_virtualenv()