chore(readme): Add models feature.

Author: Blarc

README.md

@@ -33,6 +33,7 @@ install the plugin and set OpenAI private token in plugin's settings:
 - Generate commit message from diff using OpenAI API
 - Compute diff only from the selected files and lines in the commit dialog
 - Create your own prompt for commit message generation
+- Choose any of the models available in OpenAI API
 
 ## Compatibility
 IntelliJ IDEA, PhpStorm, WebStorm, PyCharm, RubyMine, AppCode, CLion, GoLand, DataGrip, Rider, MPS, Android Studio, DataSpell, Code With Me