Update version.

README.md

@@ -10,7 +10,7 @@ by adding `hipcall_openai` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:hipcall_openai, "~> 0.3.0"}
+    {:hipcall_openai, "~> 0.5.0"}
   ]
 end
 ```