Make playing sound dependencies only used if wanted

pomodoroprompt.py

@@ -7,7 +7,6 @@ import time
 from datetime import datetime, timedelta
 from pathlib import Path
 from pytz import timezone
-from playsound import playsound
 
 import pytz
 
@@ -120,6 +119,7 @@ def main():
             print('Working on: ' + whatnext)
             countdown_to(end)
             if not QUIET:
+                from playsound import playsound
                 playsound('res/timesup.aac')
             whatdid = pomodoro_prompt_report(whatnext)
             record_task(whatnext, whatdid, start)