Fix CHANGELOG for structopt migration
@@ -257,7 +257,7 @@ fn verify_app() {
<a name="migrate-structopt"></a>
1. Add CLI tests, `-h` and `--help` output at a minimum (recommendation: [trycmd](https://docs.rs/trycmd/) for snapshot testing)
-2. Replace your dependency from `structopt = "..."` to `clap = { version = "3.0", features = "derive" }`
+2. Replace your dependency from `structopt = "..."` to `clap = { version = "3.0", features = ["derive"] }`
1. *If you use `no-default-features`:* add the `std` feature
3. Resolve compiler errors, including
1. Update your `use` statements from `structopt` and `structopt::clap` to `clap`
