Updated build command

Updated Gulp folder readme to reflect new build command that resolves the memory pressure issue.

Tools/Gulp/readme.md

@@ -25,7 +25,7 @@ npm update
 ## Build all the distributed files and tests (release build):
 
 ```
-gulp
+npm run build
 ```
 Will generate all the files of the dist/preview release folder.
 
@@ -52,4 +52,4 @@ you can now freely test in the following URLs:
 - [Materials Library](http://localhost:1338/materialsLibrary/index.html)
 - [Postprocess Library](http://localhost:1338/postProcessLibrary/index.html)
 - [Procedural Textures Library](http://localhost:1338/proceduralTexturesLibrary/index.html)
-- [Local Dev Samples](http://localhost:1338/localDev/index.html)
+- [Local Dev Samples](http://localhost:1338/localDev/index.html)