the version of realpath from pathname3 doesn't seem to work correctly…

…. switch to using expand_path here since it doesn't actually matter if we have symlinks. will fix pathname later.

lib/fssm/path.rb

@@ -82,7 +82,7 @@ def split_path(path)
   def set_path(path)
     path = FSSM::Pathname.for(path)
     raise FSSM::FileNotFoundError, "#{path}" unless path.exist?
-    @path = path.realpath
+    @path = path.expand_path
   end
 
   def set_glob(glob)