add comment attribute to file channel settings

v1/types.go

@@ -110,6 +110,8 @@ type ChannelSettingsFilesBase struct {
 	Quoting              string `json:"quoting,omitempty"`
 	Deleting             string `json:"deleting,omitempty"`
 	Max                  uint64 `json:"max_items_count,omitempty"`
+	CommentAttribute     string `json:"comment_attribute,omitempty"`
+	CommentMaxCharsCount int    `json:"comment_max_chars_count,omitempty"`
 }
 
 // FullFileResponse uploaded file data