Remove warning of development instability from README

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/README.md b/README.md
index a469f8f..b80ee11 100644
--- a/README.md
+++ b/README.md
@@ -5,11 +5,6 @@
 
 Mbed TLS includes a reference implementation of the [PSA Cryptography API](#psa-cryptography-api). This is currently a preview for evaluation purposes only.
 
-Stability
----------
-
-**Warning: the [`development`](https://github.com/ARMmbed/mbedtls/tree/development) branch of Mbed TLS currently has an unstable API.** It is where work is happening on the next major release of Mbed TLS. Until Mbed TLS 3.0 is released, if you need a stable API, please use the branch [`development_2.x`](https://github.com/ARMmbed/mbedtls/tree/development_2.x) instead.
-
 Configuration
 -------------