Update README.md

Author: paf31

README.md

@@ -2,9 +2,7 @@
 
 [![Build Status](https://travis-ci.org/purescript/purescript-typelevel-prelude.svg?branch=master)](https://travis-ci.org/purescript/purescript-typelevel-prelude)
 
-Types and kinds for basic type-level programming
-
-_Note_: this library is a work in progress, and depends on compiler features which have not been officially released yet.
+Types and kinds for basic type-level programming, for PureScript >= v0.10.5.
 
 ## Installation