Commits on Jun 7, 2021

1. Fix copying stack setting in logger's Output method …

   Minimum example to reproduce the problem:
   ```go
   package main
   
   import (
   	"os"
   
   	"github.com/pkg/errors"
   	"github.com/rs/zerolog"
   	"github.com/rs/zerolog/log"
   	"github.com/rs/zerolog/pkgerrors"
   )
   
   func main() {
   	log.Logger = log.With().Caller().Stack().Logger().Output(zerolog.ConsoleWriter{Out: os.Stderr})
   	zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
   
   	log.Info().Err(errors.New("test")).Send()
   }
   ```
   Without my changes `stack` isn't printed.

   

   adw1n committed Jun 7, 2021
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