model name typo fix

app.py

@@ -29,7 +29,7 @@ def set_openai_api_key(api_key, openai_api_key, temperature, llm_chain):
         openai_api_key = api_key
 
         os.environ["OPENAI_API_KEY"] = api_key
-        llm = OpenAI(model_name='text-davinci-03', temperature=temperature, max_tokens=512)
+        llm = OpenAI(model_name='text-davinci-003', temperature=temperature, max_tokens=512)
         os.environ["OPENAI_API_KEY"] = ""
 
         llm_chain = LLMChain(llm=llm, prompt=PROMPT_TEMPLATE, verbose=True)