Update README.md

Author: Mehdy Dara

README.md

@@ -8,6 +8,7 @@ Inspired by [grunt-image-embed](https://github.com/ehynds/grunt-image-embed) and
 
 * Supports local and remote resources.
 * Supports buffer (and stream **WIP**).
+* Ability to use a pre-process function for each resource find in CSS. Default there is no function. [Details](#optionspreprocess)
 * Ability to define a relative base directory to gulpfile.js. Default is the current directory. [Details](#optionsbasedir)
 * Ability to remove a local resource after encoding. Default is unable. [Details](#optionsdeleteafterencoding)
 * Ability to specify a weight limit. Default is 32kB which is IE8's limit. [Details](#optionsmaxweightresource)
@@ -49,6 +50,11 @@ gulp.task('default', function () {
 
 ## Options
 
+#### options.preProcess
+Type: `Function(buffer, callback)`
+
+Default value: ``
+
 #### options.baseDir
 Type: `String`
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "gulp-css-base64",
   "description": "Gulp's task for transform all resources found in a CSS into base64-encoded data URI strings",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "homepage": "http://github.com/zckrs/gulp-css-base64",
   "repository": {
     "type": "git",