Creates a download stream from a dr.dk programcard URN
npm install denmark-dr-stream#denmark-dr-stream 
> Creates a download stream from a dr.dk url
``sheel`
npm install denmark-dr-stream
`javascript`
const drvideo = require('denmark-dr-stream');
Given a programcard urn, this module will extract the manifest information,
find the video source of the highest quality and then pipe that to the stream.
The programcard urn can for example be found using the
denmark-dr-programcard
module.
`javascript``
const fs = require('fs');
const urn = 'urn:dr:mu:programcard:55f8aaa7a11f9f17c87b7254';
drvideo(urn).pipe(fs.createWriteStream('./video.mp4'));