Console appender
Console is the simplest appender. It just writes the log messages
to io.stdout.
function logging.console([logPattern])
logPattern:
A pattern can be specified to control how the message is written.
The default value is"%date %level %message\n".
Examples
require"logging.console"
local logger = logging.console()
logger:info("logging.console test")
logger:debug("debugging...")
logger:error("error!")