Include symlink destination in path info.

The existing `parse_list_line_unix` function goes to all the work of parsing symlink lines, but omits the actual destination of the symlink. This tiny change adds parsed destination to the path's info dictionary.

src/aioftp/client.py

@@ -482,6 +482,7 @@ def parse_list_line_unix(self, b):
             link_src = s[:i]
             i = -2 if link_dst[-1] == "'" or link_dst[-1] == '"' else -1
             info["type"] = "dir" if link_dst[i] == "/" else "file"
+            info["link_dst"] = link_dst
             s = link_src
         return pathlib.PurePosixPath(s), info