Set gunicorn workers to gevent

ldvspec/Dockerfile

@@ -20,4 +20,4 @@ RUN python manage.py collectstatic --settings=ldvspec.settings.dev --noinput
 EXPOSE 8000
 
 # run gunicorn
-CMD exec gunicorn ldvspec.wsgi_docker_sdc:application --bind 0.0.0.0:8000 --workers 4
+CMD exec gunicorn ldvspec.wsgi_docker_sdc:application --bind 0.0.0.0:8000 --workers 4 --worker-class gevent

ldvspec/requirements/prod.txt

 -r base.txt
-gunicorn==19.9.0
+gunicorn[gevent]==19.9.0