fix system prompt, add python-dotenv to requirements

requirements.txt

@@ -1,3 +1,4 @@
 openai==0.27
 termcolor==2.2.0
 colorama
+python-dotenv

yolo.py

@@ -115,12 +115,11 @@ if __name__ == "__main__":
       print ("No user prompt specified.")
       sys.exit(-1)
  
-  
   # Load the correct prompt based on Shell and OS and append the user's prompt
   prompt = get_full_prompt(user_prompt, shell)
 
   # Make the first line also the system prompt
-  system_prompt = prompt[1]
+  system_prompt = prompt.split("\n")[0]
   
   # Call the ChatGPT API
   response = openai.ChatCompletion.create(