Make gunicorn default access log to stdout (#490)
Make gunicorn default access log to stdout (#490)

* make gunicorn default access log to stdout

* Update python.gunicorn.sh

heroku/heroku-buildpack-python,ad-m/heroku-buildpack-python,Scalingo/python-buildpack,edmorley/heroku-buildpack-python,heroku/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,benjaminfox/heroku-buildpack-python-geoip,AltSchool/heroku-buildpack-python,benjaminfox/heroku-buildpack-python-geoip,joshfriend/heroku-buildpack-python,Scalingo/python-buildpack,skilljar/heroku-buildpack-python,ad-m/heroku-buildpack-python,AltSchool/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember