Remove production-readyness warning from README

icrate may not really be ready for user-consumption, but it's vastly better than the alternative, so let's start recommending it!

README.md

@@ -3,11 +3,6 @@
 [![License](https://badgen.net/badge/license/MIT/blue)](./LICENSE.txt)
 [![CI](https://github.com/madsmtm/objc2/actions/workflows/ci.yml/badge.svg)](https://github.com/madsmtm/objc2/actions/workflows/ci.yml)
 
-# DISCLAIMER! These crates are work in progress, and should not be used in production environments. Use the battle-tested `objc` family instead!
-
-Anyway, thanks for being here, any help testing things out is highly
-appreciated!
-
 The two crates you're interested in is probably [`icrate`], which provide a
 mostly autogenerated interface for Apple's Objective-C frameworks (`AppKit`,
 `Foundation`, `Metal`, `WebKit`, you name it), and [`objc2`], which contains