Update license badge to match Cargo.toml

Author: taiki-e

Cargo.toml

@@ -3,7 +3,7 @@ name = "async-task"
 version = "4.0.3"
 authors = ["Stjepan Glavina <[email protected]>"]
 edition = "2018"
-license = "Apache-2.0/MIT"
+license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/async-task"
 homepage = "https://github.com/smol-rs/async-task"
 documentation = "https://docs.rs/async-task"

README.md

@@ -2,7 +2,7 @@
 
 [![Build](https://github.com/smol-rs/async-task/workflows/Build%20and%20test/badge.svg)](
 https://github.com/smol-rs/async-task/actions)
-[![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg)](
+[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
 https://github.com/smol-rs/async-task)
 [![Cargo](https://img.shields.io/crates/v/async-task.svg)](
 https://crates.io/crates/async-task)