update dockerfile for new pipenv stuffs
update dockerfile for new pipenv stuffs

tested this running on docker locally, and also tested this on Heroku (no docker)

FROM ubuntu

RUN apt-get update
RUN apt-get install -y python python-pip build-essential libssl-dev libffi-dev python-dev

WORKDIR /app

ADD ./ /app

RUN pip install -r ./requirements.txt

CMD python run.py

FROM python:2

COPY . /app
WORKDIR /app

RUN pip install pipenv
RUN pipenv install --system --deploy

CMD ["gunicorn", "-b 0.0.0.0:5000", "wsgi"]
