update README

Author: itn3000

README.md

@@ -4,7 +4,7 @@
 
 [![Build status](https://ci.appveyor.com/api/projects/status/yhm2jto1ed0q0x0y/branch/master?svg=true)](https://ci.appveyor.com/project/itn3000/pooledstream-kviqp/branch/master)
 
-this project is library which aims to efficient MemoryStream for large data.
+this library aims to efficient MemoryStream for large data.
 
 **STILL UNDER DEVELOPMENT**