Fix comment

logger.go

@@ -51,7 +51,7 @@ func New() *Logger {
 	}
 }
 
-// Adds a field to the log entry, note that you it doesn't log until you call
+// Adds a field to the log entry, note that it doesn't log until you call
 // Debug, Print, Info, Warn, Fatal or Panic. It only creates a log entry.
 // If you want multiple fields, use `WithFields`.
 func (logger *Logger) WithField(key string, value interface{}) *Entry {