chore: Bump Rust edition to 2021

Author: sgryjp

Cargo.toml

@@ -7,7 +7,7 @@ repository = "https://github.com/sgryjp/pmv"
 readme = "README.md"
 license = "MIT OR Apache-2.0"
 categories = ["command-line-utilities", "filesystem"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 atty = "~0.2"

src/fsutil.rs

@@ -73,7 +73,7 @@ pub fn move_files(
 
             // Skip if the input was not "y"
             let line = line.trim();
-            if line.to_ascii_lowercase() != "y" {
+            if !line.eq_ignore_ascii_case("y") {
                 continue;
             }
         }