relay: add "tags_array" in data sent for message id "_buffer_line_added" (WeeChat protocol)

doc/en/weechat_relay_protocol.en.txt

@@ -474,7 +474,8 @@ WeeChat reserved identifiers:
 
 | _buffer_line_added       | Line added in buffer    | line |
   'buffer' (pointer), 'date' (time), 'date_printed' (time), 'displayed' (char),
-  'highlight' (char), 'prefix' (string), 'message' (string) |
+  'highlight' (char), 'tags_array' (array of strings), 'prefix' (string),
+  'message' (string) |
   Display line in buffer
 
 | _buffer_closing          | Buffer closing          | buffer |

src/plugins/relay/weechat/relay-weechat-protocol.c

@@ -454,8 +454,8 @@ relay_weechat_protocol_signal_buffer_cb (void *data, const char *signal,
                           (long unsigned int)ptr_line_data);
                 relay_weechat_msg_add_hdata (msg, cmd_hdata,
                                              "buffer,date,date_printed,"
-                                             "displayed,highlight,prefix,"
-                                             "message");
+                                             "displayed,highlight,tags_array,"
+                                             "prefix,message");
                 relay_weechat_msg_send (ptr_client, msg);
                 relay_weechat_msg_free (msg);
             }