Updated README.md to include headers option

Author: okonet

README.md

@@ -36,6 +36,9 @@ grunt.initConfig({
  options: {
  url: 'http://example.com/template/123/?token=<%= config.apiKey %>',
  method: 'PUT',
+ headers: {
+ 'Authorization': 'Token <%= your_token_here %>'
+ },
  data: {
  someKey: 'some value'
  }
@@ -70,6 +73,12 @@ DefaultValue: `{}`
 
 Any form data fields to be sent in addition to the file upload
 
+#### options.headers
+Type: `Object`
+DefaultValue: `{}`
+
+Headers to send along with your HTTP request. For example, a lot of API require the Authentication to be sent through the Headers.
+
 #### src
 Type: `String`
 Default value: `''`
@@ -111,7 +120,7 @@ You should fork this repo, and issue a Pull Request with your proposed changes.
 
 ### Roadmap ideas
 For now the upload is limited to 1 file per target. This could change if I find a scenario needing it.
-Also, it is not possible to add additional payload (no custom data). A lot of API require the Authentication to be sent through the Headers, so this might be one of the next improvement.
+Also, it is not possible to add additional payload (no custom data).
 
 ## Release History
 - 0.1.2 - 2014-04-03: Updated Restler to latest (3.2.0) version.