Update directions for masonry-layout

README.md

@@ -23,10 +23,9 @@ Run the gallery generator for Sprockets:
 
     $ rails g blacklight_gallery:install
 
-Or for node based bundlers add `blacklight-gallery` as a dependency and add this to your entrypoint:
+Or for node based bundlers add `blacklight-gallery masonry-layout@v4` as a dependencies and add this to your entrypoint:
 ```js
 import 'blacklight-gallery/vendor/assets/javascripts/imagesloaded.min.js'
-import 'blacklight-gallery/vendor/assets/javascripts/masonry.min.js'
 import 'blacklight-gallery/app/assets/javascripts/blacklight_gallery/slideshow'
 import 'blacklight-gallery/app/assets/javascripts/blacklight_gallery/masonry'
 ```