changelog update and typo fix
changelog update and typo fix

Scalingo/python-buildpack,Scalingo/python-buildpack,heroku/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,benmurden/heroku-buildpack-python-ember,AltSchool/heroku-buildpack-python,skilljar/heroku-buildpack-python,heroku/heroku-buildpack-python,AltSchool/heroku-buildpack-python