Remove warning of development instability from README

Signed-off-by: Dave Rodgman <>
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index a469f8f..b80ee11 100644
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@@ -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.
-**Warning: the [`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`]( instead.