Remove feature(test), use Rust stable.

huacnlee · huacnlee · commit 9a989f1b3e79 · 2022-04-21T14:42:53.000+08:00
diff --git a/autocorrect/src/lib.rs b/autocorrect/src/lib.rs
@@ -44,7 +44,6 @@ fn main() {
 }
 ```
 */
-#![feature(test)]
 
 #[cfg(feature = "bench")]
 extern crate test;
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "nightly"
+channel = "stable"
