fix formatting

Author: joao-r-reis

logger.go

@@ -37,7 +37,7 @@ import (
 // Deprecated: use StructuredLogger instead
 type StdLogger interface{}
 
-func logHelper(logger StructuredLogger, level LogLevel, msg string, fields... LogField) {
+func logHelper(logger StructuredLogger, level LogLevel, msg string, fields ...LogField) {
 	switch level {
 	case LogLevelDebug:
 		logger.Debug(msg, fields...)