Update README: HLS is no longer in *very* early stage

Given relative feature-parity with HIE and #473 this line is no longer true, I believe.

Author: Anrock

README.md

@@ -12,8 +12,6 @@ Integration point for [ghcide](https://github.com/haskell/ghcide) and [haskell-i
 them all. Read the [project's
 background](https://neilmitchell.blogspot.com/2020/01/one-haskell-ide-to-rule-them-all.html).
 
-This is *very* early stage software.
-
 - [Haskell Language Server (HLS)](#haskell-language-server)
   - [Features](#features)
   - [Installation](#installation)