Update README.md (#17)

heterogenous -> heterogeneous

Author: eltociear

README.md

@@ -160,4 +160,4 @@ Thanks to:
 * Lightning AI for supporting pytorch and work in flash attention, int8 quantization, and LoRA fine-tuning.
 * GGML for driving forward fast, on device inference of LLMs
 * Karpathy for spearheading simple, interpretable and fast LLM implementations
-* MLC-LLM for pushing 4-bit quantization performance on heterogenous hardware
+* MLC-LLM for pushing 4-bit quantization performance on heterogeneous hardware