Change docs to match new parameters

Author: okaufmann

README.md

@@ -1,9 +1,17 @@
-elixir-typescript (forked from laravel-elixir-typescript by [MikeyAlder](https://github.com/MikeyAlder/laravel-elixir-typescript))
+elixir-typescript 
 ========================
 
+**(forked from laravel-elixir-typescript by [MikeyAlder](https://github.com/MikeyAlder/laravel-elixir-typescript))**
+
 ## Prerequirement
 You have to install [Laravel's Elixir](http://laravel.com/docs/master/elixir)(Version 3.0 or higher) and its dependencies first.
 
+## Upgrade
+The signature was changed to the following:
+```
+mix.typescript(outputFileName, outputFolder, search, options);
+```
+
 ## Installation
 Install with Node.js
 ```
@@ -32,4 +40,13 @@ If you'd like to output to a different directory than the default `public/js`, t
 
 ```
 mix.typescript('app.js', 'public/js/foo/bar');
-```
+```
+
+## Parameters
+
+Bellow is the list of the available parameters:
+
+- **outputFileName**: Filename for output
+- **outputFolder**(optional): Where to place the output file. Default: `public/js/`
+- **search** (optional): filter for input files, can also be a direct path to one file like `app.ts`. Defaults: `/**/*.ts`
+- **options** (optional): Options to forward to the `gulp-typescript` used for compiling. All options under https://github.com/ivogabe/gulp-typescript#options