- add TextUnmarshaler - add TextMarshaler - update json.Marshaler - update json.Unmarshaler - update string name Emergency and Critical - add test json Unmarshaler and Marshaler Reviewed-on: https://gitoa.ru/go-4devs/log/pulls/7 Co-authored-by: andrey <andrey@4devs.io> Co-committed-by: andrey <andrey@4devs.io>