Sharp deprecation warnings

[strarsis]

Deprecation warnings from sharp are logged when running gulp-responsive:

[...]
quality: use jpeg({ quality: ... }), webp({ quality: ... }) and/or tiff({ quality: ... }) instead
progressive: use jpeg({ progressive: ... }) and/or png({ progressive: ... }) instead
withoutChromaSubsampling: use jpeg({ chromaSubsampling: "4:4:4" }) instead
compressionLevel: use png({ compressionLevel: ... }) instead
[...]

See also at https://github.com/lovell/sharp/blob/master/lib/output.js#L429.

[Nicholaiii]

Duplicate of #61.

However, I would really like to see this fixed :)