修复由于初始化的时候没有保存redis config导致调用WithContext方法再次初始化实例时会丢失config对象导致空指针错误 (…

…#34)

Co-authored-by: 朱祥东 <[email protected]>

redis.go

@@ -54,6 +54,7 @@ func NewRedis(ctx context.Context, config config.Config, store string) (*Redis,
 		prefix:   fmt.Sprintf("%s:", config.GetString("cache.prefix")),
 		instance: client,
 		store:    store,
+		config:   config,
 	}, nil
 }