docs: remove note regarding tokio usage for the exmaple

Author: brianheineman

postgresql_archive/README.md

@@ -14,7 +14,6 @@ A library for downloading and extracting PostgreSQL archives from
 ## Examples
 
 ### Asynchronous API
-**Note**: The following example requires the `tokio` runtime.
 
 ```rust
 use postgresql_archive::{extract, get_archive, LATEST};

postgresql_archive/src/lib.rs

@@ -20,7 +20,6 @@
 //! ## Examples
 //!
 //! ### Asynchronous API
-//! **Note**: The following example requires the `tokio` runtime.
 //!
 //! ```rust, ignore
 //! use postgresql_archive::{extract, get_archive, LATEST};