readme - recommend grunt-newer for caching images

fixes imagemin/imagemin#13
gruntjs · Mar 28, 2014 · 1f44a25 · 1f44a25
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diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ Task targets, files and options may be specified according to the grunt [Configu
 
 Minify images using [OptiPNG](http://optipng.sourceforge.net), [pngquant](http://pngquant.org), [jpegtran](http://jpegclub.org/jpegtran/) and [gifsicle](http://www.lcdf.org/gifsicle).
 
-Images will be cached and only minified again if they change.
+We recommend using [grunt-newer](https://github.com/tschaub/grunt-newer) to only process changed files as minifying images can be quite slow.
 
 ### Options
 
@@ -134,4 +134,4 @@ grunt.registerTask('default', ['imagemin']);
 
 Task submitted by [Sindre Sorhus](http://github.com/sindresorhus)
 
-*This file was generated on Wed Mar 26 2014 00:39:04.*
+*This file was generated on Fri Mar 28 2014 18:10:05.*
diff --git a/docs/imagemin-overview.md b/docs/imagemin-overview.md
@@ -2,4 +2,4 @@ Task targets, files and options may be specified according to the grunt [Configu
 
 Minify images using [OptiPNG](http://optipng.sourceforge.net), [pngquant](http://pngquant.org), [jpegtran](http://jpegclub.org/jpegtran/) and [gifsicle](http://www.lcdf.org/gifsicle).
 
-Images will be cached and only minified again if they change.
+We recommend using [grunt-newer](https://github.com/tschaub/grunt-newer) to only process changed files as minifying images can be quite slow.