🚨 removed linter warnings for Python code

develop/amalgamate/CHANGES.md

+The following changes have been made to the code with respect to <https://github.com/edlund/amalgamate/commit/c91f07eea1133aa184f652b8f1398eaf03586208>:
+
+- Resolved inspection results from PyCharm:
+  - replaced tabs with spaces
+  - added encoding annotation
+  - reindented file to remove trailing whitespaces
+  - unused import `sys`
+  - membership check
+  - made function from `_is_within`
+  - removed unused variable `actual_path`