Mention JSON-LD minification (#147)

README.md

@@ -123,6 +123,10 @@ Minifier options like `sortAttributes` and `sortClassName` won't impact the plai
 
 If you have chunks of markup you would like preserved, you can wrap them `<!-- htmlmin:ignore -->`.
 
+### Minifying JSON-LD
+
+You can minify script tags with JSON-LD by setting the option `{ processScripts: ['application/ld+json'] }`. Note that this minification is very rudimentary, it is mainly useful for removing newlines and excessive whitespace. 
+
 ### Preserving SVG tags
 
 SVG tags are automatically recognized, and when they are minified, both case-sensitivity and closing-slashes are preserved, regardless of the minification settings used for the rest of the file.