add missing import

playback.py

@@ -42,6 +42,9 @@ import const
 import logging
 logger = logging.getLogger(__name__)
 
+from pathlib import Path
+
+
 
 # Does anybody read this stuff? There's a PEP somewhere that says I should do this.
 __author__     = 'Cortney T. Buffington, N0MJS and Mike Zingman, N4IRR'