Add missing import

Author: ribice

docs/platforms/go/guides/zerolog/index.mdx

@@ -30,7 +30,8 @@ To integrate Sentry with Zerolog, you need to set up a custom writer that sends
 import (
 	"errors"
 	"time"
-	
+	"os"
+
 	"github.com/getsentry/sentry-go"
 	sentryzerolog "github.com/getsentry/sentry-go/zerolog"
 	"github.com/rs/zerolog"
@@ -113,5 +114,3 @@ FlushTimeout time.Duration
 Use Zerolog as you normally would, and it will automatically send logs at or above the specified levels to Sentry.
 
 Note: Ensure Sentry is flushed before the application exits to avoid losing any pending events.
-
-