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readme: add a better server listening example
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Readme.md

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@@ -48,8 +48,10 @@ const pets = {
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app.use(_.get('/pets', pets.list));
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app.use(_.get('/pets/:name', pets.show));
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app.listen(3000);
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console.log('listening on port 3000');
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app.listen(3000, (err) => {
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if (err) console.error(err.stack);
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else console.log('listening on port 3000');
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});
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```
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## License

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