added Kuzzle version requirement

Author: scottinet

README.md

@@ -1,9 +1,11 @@
 [![Build Status](https://travis-ci.org/kuzzleio/sdk-javascript.svg?branch=master)](https://travis-ci.org/kuzzleio/sdk-javascript) [![codecov.io](http://codecov.io/github/kuzzleio/sdk-javascript/coverage.svg?branch=master)](http://codecov.io/github/kuzzleio/sdk-javascript?branch=master) [![Dependency Status](https://david-dm.org/kuzzleio/sdk-javascript.svg)](https://david-dm.org/kuzzleio/sdk-javascript)
 
 
-Kuzzle
+Official Kuzzle Javascript SDK 
 ======
 
+:warning: This SDK version requires Kuzzle v0.5.6 or higher.
+
 ## About Kuzzle
 
 For UI and linked objects developers, Kuzzle is an open-source solution that handles all the data management (CRUD, real-time storage, search, high-level features, etc).
@@ -86,7 +88,7 @@ kuzzle
 
 ### HTML
 
-#### Vanilla
+#### Using automatic builds
 
 Download the file [kuzzle.min.js](https://raw.githubusercontent.com/kuzzleio/sdk-javascript/browser/kuzzle.min.js) available in the [browser](https://github.com/kuzzleio/sdk-javascript/tree/browser) branch of this project.
 
@@ -120,6 +122,10 @@ kuzzle
 });
 ```
 
+#### Building manually
+
+Clone this github repository and run ``grunt``. A ``browser`` directory will be created, containing a plain browserified version of this SDK, and a minified version.
+
 # License
 
 [Apache 2](LICENSE.md)