3.0.19 (#384)

* fix(config.ts): move 'gpt-4o-mini' in MODEL_LIST
* docs(config.ts): update API key validation message with detailed instructions
* refactor(config.ts): simplify model validation logic to check for string type instead of MODEL_LIST

* 3.0.19

package.json

@@ -1,6 +1,6 @@
 {
   "name": "opencommit",
-  "version": "3.0.18",
+  "version": "3.0.19",
   "description": "Auto-generate impressive commits in 1 second. Killing lame commits with AI 🤯🔫",
   "keywords": [
     "git",