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");

src/steps.rs

@@ -119,6 +119,12 @@ pub fn run_fwupdmgr(fwupdmgr: &PathBuf) -> Result<(), failure::Error> {
     Ok(())
 }
 
+pub fn run_rustup(rustup: &PathBuf) -> Result<(), failure::Error> {
+    Command::new(rustup).arg("update").spawn()?.wait()?.check()?;
+
+    Ok(())
+}
+
 pub fn upgrade_macos() -> Result<(), failure::Error> {
     Command::new("softwareupdate")
         .args(&["--install", "--all"])