Adding the ability to have return lines in .env files\

[aadamsx]

Being able to do actual return lines, and not having to do a \n for new lines would be great for .env files.

For example when building a Dockerfile, I don't want to have to:

DOCKER_CONTENTS='FROM node:8.11.4\nRUN mkdir -p /usr/app\nCOPY .'

It would be nice to do this instead:

DOCKER_CONTENTS=" FROM node:8.11.4 / RUN mkdir -p /usr/app COPY . "