add DEFAULT_MODEL to .env.sample

+ fix typo

.env.sample

@@ -1 +1,2 @@
 OPENAI_API_KEY=your_api_key
+DEFAULT_MODEL=gpt-3.5-turbo

wolverine.py

@@ -60,7 +60,7 @@ def json_validated_response(model, messages):
     except (json.decoder.JSONDecodeError, ValueError) as e:
         cprint(f"{e}. Re-running the query.", "red")
         # debug
-        cprint(f"\n\GPT RESPONSE:\n\n{content}\n\n", "yellow")
+        cprint(f"\nGPT RESPONSE:\n\n{content}\n\n", "yellow")
         # append a user message that says the json is invalid
         messages.append(
             {