Readme issue

[maliyshock]

Please fix the issue in the readme
import retina from 'retinajs'; should be import retina from 'retinajs';
https://monosnap.com/file/5kyKL4YuAufNvWIHK5rhzfllesPwLM

also put somwhere npm install retinajs otherwise you may think that you need to npm install retina which is wrong. I spent 15 minutes to guess where is the mistake.

[igolka97]

Plus one on this. I spend about 3 hours (!) to find this mistake...