Put comment on a separate line

The comment is not stripped from the value by the ConfigParser, so

    identifiers = text ; foo

didn't work.

Although the documention says that inline comments are allowed:
https://docs.python.org/2/library/configparser.html?highlight=comment

topydo.conf

@@ -5,7 +5,8 @@ default_command             = ls
 ; filename                  = todo.txt
 ; archive_filename          = done.txt
 colors                      = 1
-identifiers                 = linenumber ; or: text
+; identifiers can be 'linenumber' or 'text'
+identifiers                 = linenumber
 backup_count                = 5
 
 [add]