feat: add instructions and support for configuring GPT-4 Turbo (Preview) (#274)

* docs(README.md): add instructions for configuring GPT-4 Turbo (Preview)
feat(config.ts): include 'gpt-4-1106-preview' in the list of supported models

* fix(config.ts): update error message to include 'gpt-4-1106-preview' as a supported model

Author: superstructor

README.md

@@ -125,6 +125,12 @@ or for as a cheaper option:
 oco config set OCO_MODEL=gpt-3.5-turbo
 ```
 
+or for GPT-4 Turbo (Preview) which is more capable, has knowledge of world events up to April 2023, a 128k context window and 2-3x cheaper vs GPT-4:
+
+```sh
+oco config set OCO_MODEL=gpt-4-1106-preview
+```
+
 Make sure that you spell it `gpt-4` (lowercase) and that you have API access to the 4th model. Even if you have ChatGPT+, that doesn't necessarily mean that you have API access to GPT-4.
 
 ### Locale configuration

src/commands/config.ts

@@ -129,9 +129,10 @@ export const configValidators = {
         'gpt-3.5-turbo',
         'gpt-4',
         'gpt-3.5-turbo-16k',
-        'gpt-3.5-turbo-0613'
+        'gpt-3.5-turbo-0613',
+        'gpt-4-1106-preview'
       ].includes(value),
-      `${value} is not supported yet, use 'gpt-4', 'gpt-3.5-turbo-16k' (default), 'gpt-3.5-turbo-0613' or 'gpt-3.5-turbo'`
+      `${value} is not supported yet, use 'gpt-4', 'gpt-3.5-turbo-16k' (default), 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo' or 'gpt-4-1106-preview'`
     );
     return value;
   },