docs: Note feature needed in demo

This commit is contained in:
Ed Page 2021-12-07 15:02:14 -06:00
parent 6001e66721
commit 48a5e4931a

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@ -65,6 +65,7 @@ fn main() {
// more program logic goes here... // more program logic goes here...
} }
``` ```
*(note: requires feature `derive`)*
```bash ```bash
$ demo --help $ demo --help
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