Remove 'deleted' parameter from LibraryClient.get_folders() that neve…

…r worked.

bioblend/galaxy/libraries/__init__.py

@@ -162,7 +162,7 @@ def create_folder(self, library_id, folder_name, description=None, base_folder_i
             payload['description'] = description
         return Client._post(self, payload, id=library_id, contents=True)
 
-    def get_folders(self, library_id, folder_id=None, name=None, deleted=False):
+    def get_folders(self, library_id, folder_id=None, name=None):
         """
         Get all the folders or filter specific one(s) via the provided ``name``
         or ``folder_id`` in data library with id ``library_id``. Provide only one
@@ -176,10 +176,6 @@ def get_folders(self, library_id, folder_id=None, name=None, deleted=False):
                      path of the folder starting from the library's root
                      folder, e.g. ``/subfolder/subsubfolder``.
 
-        :type deleted: bool
-        :param deleted: If set to ``True``, return folders that have been
-                        deleted.
-
         :rtype: dict
         :return: list of dicts each containing basic information about a folder.
         """