Update cfg.json in release package.
Update cfg.json in release package.

v5.1.5 壓縮包中的 cfg.json 有誤，重新更新一版到 v5.1.6，程式檔案不變，僅更新壓縮包中的 cfg.json。
masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend