Gigachat

What's Changed
* Fix/json dumping by Rai220 in https://github.com/ai-forever/gigachat/pull/60


**Full Changelog**: https://github.com/ai-forever/gigachat/compare/v0.1.39...v0.1.39post1

What's Changed
* Adds new API methods by Mikelarg in https://github.com/ai-forever/gigachat/pull/58


**Full Changelog**: https://github.com/ai-forever/gigachat/compare/v0.1.38...v0.1.39

What's Changed
* Исправление опечаток by Lytkini in https://github.com/ai-forever/gigachat/pull/56
* feat: Добавил X-Headers by Mikelarg in https://github.com/ai-forever/gigachat/pull/57


**Full Changelog**: https://github.com/ai-forever/gigachat/compare/v0.1.37...v0.1.38

What's Changed
* chore: version up by Rai220 in https://github.com/ai-forever/gigachat/pull/54

**Full Changelog**: https://github.com/ai-forever/gigachat/compare/v0.1.37...v0.1.37post1