readme: add missing info (ggml-org#1324)

Author: prusnak

README.md

@@ -18,10 +18,12 @@ The main goal of `llama.cpp` is to run the LLaMA model using 4-bit integer quant
 
 - Plain C/C++ implementation without dependencies
 - Apple silicon first-class citizen - optimized via ARM NEON and Accelerate framework
-- AVX2 support for x86 architectures
+- AVX, AVX2 and AVX512 support for x86 architectures
 - Mixed F16 / F32 precision
-- 4-bit integer quantization support
+- 4-bit, 5-bit and 8-bit integer quantization support
 - Runs on the CPU
+- OpenBLAS support
+- cuBLAS and CLBlast support
 
 The original implementation of `llama.cpp` was [hacked in an evening](https://github.com/ggerganov/llama.cpp/issues/33#issuecomment-1465108022).
 Since then, the project has improved significantly thanks to many contributions. This project is for educational purposes and serves