v4.0.0 Pass custom logger to the ClusterWS

[goriunov]

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Details

Pass custom logger to the ClusterWS instance with mainly used 2 functions error, info ex:

new ClusterWS({
logger: {
  error: (msg) => {
      console.log(msg)
   },
  info: (msg) => {
      console.log(msg)
  }
}
})

It is useful if you use some kind of logger system such as Papertrail to easily track logs coming from ClusterWS.