Merge pull request #39 from dejavu1987/patch-1

Add "gpt-3.5-turbo-16k" model chat_completion.rs

Author: Dongri Jin

src/v1/chat_completion.rs

@@ -6,6 +6,7 @@ use crate::impl_builder_methods;
 use crate::v1::common;
 
 pub const GPT3_5_TURBO: &str = "gpt-3.5-turbo";
+pub const GPT3_5_TURBO_16K: &str = "gpt-3.5-turbo-16k";
 pub const GPT3_5_TURBO_0301: &str = "gpt-3.5-turbo-0301";
 pub const GPT3_5_TURBO_0613: &str = "gpt-3.5-turbo-0613";