Rustfmt (fixes #16)

src/main.rs

@@ -100,6 +100,11 @@ fn main() -> Result<(), Error> {
         }
     }
 
+    if let Ok(rustup) = which("rustup") {
+        terminal.print_separator("rustup");
+        run_rustup(&rustup).report("rustup", &mut reports);
+    }
+
     let cargo_upgrade = home_path(".cargo/bin/cargo-install-update");
     if cargo_upgrade.exists() {
         terminal.print_separator("Cargo");