[proposal] Update sails.config.log.md

[OnbitShashan]

"npm i winston" now installs new Winston 3.x.x version. Making changes therefor users do not confuse with non working code

[sailsbot]

Hi @OnbitShashan! It looks like the title of your pull request doesn’t quite match our guidelines yet. Would you please edit your pull request's title so that it begins with [proposal], [patch], [fixes #<issue number>], [implements #<other PR number>], or [misc]? Once you've edited it, I'll take another look!

[sailsbot]

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[abilash1104]

`var winston = require('winston');
var customLogger = winston.createLogger();
// A console transport logging debug and above.
customLogger.add(new winston.transports.Console, {
level: 'debug',
colorize: true
});
// A file based transport logging only errors formatted as json.
customLogger.add(new winston.transports.File({
level: 'error',
filename: 'filename.log',
format: winston.format.json(),
}));
module.exports.log = {
// Pass in our custom logger, and pass all log levels through.
custom: customLogger,
level: 'silly',

// Disable captain's log so it doesn't prefix or stringify our meta data.
inspect: false
};`
I tried the above code, but it gives TypeError: self._addDefaultMeta is not a function.
Can you please look into it and suggest some way to resolve the error. @OnbitShashan