update duct_sh to edition 2021

Author: oconnor663

duct_sh/Cargo.toml

@@ -6,6 +6,7 @@ description = "a sub-crate for the sh function, formerly in duct"
 repository = "https://github.com/oconnor663/duct.rs/tree/master/duct_sh"
 documentation = "https://docs.rs/duct_sh"
 license = "MIT"
+edition = "2021"
 
 [dependencies]
 duct = { path = "../", version = "0.13" }

duct_sh/src/lib.rs

@@ -136,15 +136,17 @@ fn shell_command_argv(command: OsString) -> Vec<OsString> {
 
 #[cfg(test)]
 mod tests {
+    use super::*;
+
     #[test]
     fn test_sh() {
-        let out = ::sh("echo hi").read().unwrap();
+        let out = sh("echo hi").read().unwrap();
         assert_eq!("hi", out);
     }
 
     #[test]
     fn test_sh_dangerous() {
-        let out = ::sh_dangerous("echo hi".to_owned()).read().unwrap();
+        let out = sh_dangerous("echo hi".to_owned()).read().unwrap();
         assert_eq!("hi", out);
     }
 }