Update README.md

Alexandre-Herve · web-flow · commit d959e9a85f8e · 2023-09-22T12:32:24.000+02:00
diff --git a/README.md b/README.md
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 A demo repository with a book store API example.
+
+Run `optic run`, then make some changes to `bookstore.yml` and run `optic run` again.

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`@@ -1 +1,3 @@`
`1`	`1`	`A demo repository with a book store API example.`
	`2`	`+`
	`3`	+Run `optic run`, then make some changes to `bookstore.yml` and run `optic run` again.