Remove future annotations import from PPM file

Author: cclauss

compression/ppm.py …ession/prediction_by_partial_matching.pycompression/ppm.py renamed to data_compression/prediction_by_partial_matching.py compression/ppm.py renamed to data_compression/prediction_by_partial_matching.py

@@ -1,9 +1,7 @@
-from __future__ import annotations
-
 import sys
 from collections import defaultdict
 
-# Description for the ppm algorithm can be found at https://en.wikipedia.org/wiki/Prediction_by_partial_matching
+# Description for the PPM algorithm can be found at https://en.wikipedia.org/wiki/Prediction_by_partial_matching
 
 
 class PPMNode: