changed "tokenizer" typo to be the one we create.

README.md

@@ -130,7 +130,7 @@ chat = [
   {"role": "system", "content": "You are DiscoLM, a helpful assistant."},
   {"role": "user", "content": "Please tell me possible reasons to call a research collective Disco Research"}
 ]
-x = tokenizer.apply_chat_template(chat, tokenize=True, return_tensors="pt", add_generation_prompt=True).cuda()
+x = tok.apply_chat_template(chat, tokenize=True, return_tensors="pt", add_generation_prompt=True).cuda()
 x = model.generate(x, max_new_tokens=128).cpu()
 print(tok.batch_decode(x))
 ```