Reference to XTTS

[d3on4pcsm]

The described model architecture is same as the XTTS. To be fair, you should give a reference to their work as I stated #156

[RVC-Boss]

GPT-SoVITS既没有使用XTTS的任何代码，也没有参考任何XTTS的模型结构，引用XTTS的仓库是不符合逻辑的。 GPT-SoVITS neither utilizes any code from XTTS nor references any model structure from XTTS. Citing the XTTS repository is logically inconsistent.