Clippy (#331)

src/main.rs

@@ -123,7 +123,7 @@ For more information about this issue see https://askubuntu.com/questions/110969
                         return result;
                     }
                 }
-                print_warning(format!("Self update error: {}", e));
+                print_warning(format!("Self update error: {e}"));
             }
         }
     }

src/self_update.rs

@@ -31,7 +31,7 @@ pub fn self_update() -> Result<()> {
     if let UpdateStatus::Updated(release) = &result {
         println!("\nTopgrade upgraded to {}:\n", release.version);
         if let Some(body) = &release.body {
-            println!("{}", body);
+            println!("{body}");
         }
     } else {
         println!("Topgrade is up-to-date");