Add a nop for api/logout/

It's there for etesync.com and is used to invalidate the token.
Unfortunately we can't fully implement it here because the token
implementation is lacking. This will be fixed soon once we update the
token library with the next version of the protocol.

etesync_server/urls.py

@@ -34,6 +34,8 @@ from django.views.generic import TemplateView
 
 from rest_framework_nested import routers
 from rest_framework.authtoken import views as token_views
+from rest_framework.decorators import api_view
+from rest_framework.response import Response
 
 from journal import views
 
@@ -47,11 +49,17 @@ journals_router.register(r'members', views.MembersViewSet, basename='journal-mem
 journals_router.register(r'entries', views.EntryViewSet, basename='journal-entries')
 
 
+@api_view(['POST'])
+def nop_view(request):
+    return Response({})
+
+
 urlpatterns = [
     re_path(r'^api/v1/', include(router.urls)),
     re_path(r'^api/v1/', include(journals_router.urls)),
     re_path(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
     re_path(r'^api-token-auth/', token_views.obtain_auth_token),
+    path('api/logout/', nop_view),
     path('admin/', admin.site.urls),
     path('', TemplateView.as_view(template_name='success.html')),
 ]