Update README and config.rs to mark GPT4o as the newer model

README.md

@@ -45,7 +45,7 @@ you can set their paths and filenames via `HEY_CONFIG_PATH`, `HEY_CONFIG_FILENAM
 
 ## config file reference
 ```toml
-model = "Claude" # or "GPT3"
+model = "Claude" # or "GPT4OMini"
 tos = false # whether if you agree to ddg chat tos
 ```
 

src/config.rs

@@ -8,13 +8,13 @@ pub enum Model {
     // outdated
     Claude12,
     GPT35,
+    GPT3,
 
     // current
     Claude,
-    GPT3,
+    GPT4OMini,
     Llama,
-    Mixtral,
-    GPT4OMini
+    Mixtral
 }
 
 impl ToString for Model {