Update version number in Readme

Author: atouchet

README.md

@@ -23,7 +23,7 @@ optional features, so your `Cargo.toml` could look like this:
 
 ```toml
 [dependencies]
-reqwest = { version = "0.11", features = ["json"] }
+reqwest = { version = "0.12", features = ["json"] }
 tokio = { version = "1", features = ["full"] }
 ```