Remove obsolete note about stability

Author: mcarton

doc/README.md

@@ -2,13 +2,6 @@
 
 This crate provides a set of alternative `#[derive]` attributes for Rust.
 
-## Stability
-
-This crate is not stable yet and the attributes might change at any time.
-
-For now the crate only works on nightly but it uses *rustc*'s Macros 1.1 and is
-meant to be usable on stable as soon as it is possible.
-
 ## Examples
 
 *derivative* uses attributes to make it possible to derive more implementations