Print stderr with --show-output flag

The `--print-stdout` flag has been changed to `--show-output` and now
both stderr and stdout are forwarded when this option is specified.

src/hyperfine/types.rs

@@ -91,7 +91,7 @@ pub struct HyperfineOptions {
     pub output_style: OutputStyleOption,
 
     /// Forward benchmark's stdout to hyperfine's stdout
-    pub print_stdout: bool,
+    pub show_output: bool,
 }
 
 impl Default for HyperfineOptions {
@@ -103,7 +103,7 @@ impl Default for HyperfineOptions {
             failure_action: CmdFailureAction::RaiseError,
             preparation_command: None,
             output_style: OutputStyleOption::Full,
-            print_stdout: false,
+            show_output: false,
         }
     }
 }