feat: process subfolders when given folder path
feat: process subfolders when given folder path

When give a path argument on the CLI, traverse all subfolders looking for potential targets

decaffeinate/decaffeinate,alangpierce/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate,decaffeinate/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate