Update version.json

[ UPDATE ] - v1.2.1

## Added
- Added support for `llama-3`
- Added syntax for exiting/quitting the program to the beginning of the conversation in `perplexity.py`
- Added goodbye syntax to the end of the search request in `perplexity.py`

## Changed
- Changed variable names in `config.py`
- Set default models to models from config or env in `perplexity.py`
- Updated syntax in `cli.py`

## Removed
- Removed unused timeout in `client.py`

.github/version.json

@@ -1,3 +1,3 @@
 {
-    "version": "v1.2.0"
+    "version": "v1.2.1"
 }