Fix Readme

[marcospgp]

min: Boolean — preserving aspect ratio, resize the image to be as small as possible while ensuring its dimensions are greater than or equal to the width and height specified.

This part of the readme is missing a default value for the min option.

Cheers!

Edit: also, what happens if both min and max are defined?

Edit 2: I noticed there are links to the sharp documentation, but they are broken 😟 there is a pull request with the fixes! Please accept it 😄

[feliperobledo]

Hello!
First off, thanks a lot for making this package in the first place.

As for the ask above, I would remove the following:

If you are using Mac OS then before installing `gulp-responsive` you should install the libvips library

sharp will install its own version of libvips in your system, at least on macOS.

By manually installing libvips ourselves, we pulled version 8.9.0. If that is present, sharp's installation process breaks because it is expecting version 8.8.1.

Furthermore, to install the latest version of sharp, you need to be on node 12.*.

Please let me know if you have any questions.