chores: udpate readme (#2264)

README.md

@@ -73,6 +73,9 @@ For building binary if you wish to build from source, then `cargo` is required.
 ```lua
 {
   "yetone/avante.nvim",
+  -- if you want to build from source then do `make BUILD_FROM_SOURCE=true`
+  build = "make",  -- ⚠️ must add this line! ! !
+  -- build = "powershell -ExecutionPolicy Bypass -File Build.ps1 -BuildFromSource false" -- for windows
   event = "VeryLazy",
   version = false, -- Never set this value to "*"! Never!
   ---@module 'avante'
@@ -80,23 +83,19 @@ For building binary if you wish to build from source, then `cargo` is required.
   opts = {
     -- add any opts here
     -- for example
-    provider = "openai",
+    provider = "claude",
     providers = {
-      openai = {
-        endpoint = "https://api.openai.com/v1",
-        model = "gpt-4o", -- your desired model (or use gpt-4o, etc.)
-        extra_request_body = {
-          timeout = 30000, -- Timeout in milliseconds, increase this for reasoning models
-          temperature = 0.75,
-          max_completion_tokens = 8192, -- Increase this to include reasoning tokens (for reasoning models)
-          --reasoning_effort = "medium", -- low|medium|high, only used for reasoning models
-        },
+      claude = {
+        endpoint = "https://api.anthropic.com",
+        model = "claude-sonnet-4-20250514",
+        timeout = 30000, -- Timeout in milliseconds
+          extra_request_body = {
+            temperature = 0.75,
+            max_tokens = 20480,
+          },
       },
     },
   },
-  -- if you want to build from source then do `make BUILD_FROM_SOURCE=true`
-  build = "make",
-  -- build = "powershell -ExecutionPolicy Bypass -File Build.ps1 -BuildFromSource false" -- for windows
   dependencies = {
     "nvim-treesitter/nvim-treesitter",
     "nvim-lua/plenary.nvim",