Add function to get the path segments of a path relative to another

docs/CHANGELOG.md

@@ -23,4 +23,5 @@
 - Add class for Python docstrings
 - Add feature to parse Python docstrings
 - Add function to ensure a non-empty string.
-- Add Python definition documentation generator
+- Add Python definition documentation generator
+- Add function to get the path segments of a path relative to another