Shorten file_type description to satisfy Pylint

hepdata_lib/__init__.py

@@ -79,7 +79,7 @@ def add_additional_resource(self, description, location, copy_file=False, file_t
         :param copy_file: If set to true, will attempt to copy a local file to the tar ball.
         :type copy_file: bool
 
-        :param file_type: Type of the resource file.  Currently, only "HistFactory" or "ProSelecta" has any effect.
+        :param file_type: Type of the resource file (None, "HistFactory" or "ProSelecta").
         :type file_type: string
 
         :param resource_license: License information comprising name, url and optional description.