enhance message for logs with no transports #2114

[zizifn]

If the user uses logger with no transports, Winston will only console certain logs with a warning.

As we add documentation for the point memory issue in PR #2138. Today, when I discuss this with team member cc @superobin, maybe it's better to enhance the existing no transports warning message.

Message in this PR:

Test code :

const w = require('winston')
// const w = require('./lib/winston')

setInterval(() => {
    w.error('test'.repeat(100))
}, 10)

[zizifn]

@wbt Could you take look at this PR? Sorry for the back and forth for issue #2114, If you think change code maybe exaggerate this issue, I'm fine for close PR.