fix example in graceful-shutdown.md: add drop(listener)
#148
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Need to drop the listener for the graceful shutdown to fully succeed. Otherwise, even though we cannot `curl` the server addr, `netstat` still shows the process listening. This will align the example with the hyper-util example in: https://github.com/hyperium/hyper-util/blob/e74ab7888638e768de17c47ed5f20c8b623a308f/examples/server_graceful.rs#L47
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Need to drop the listener for the graceful shutdown to fully succeed. Otherwise, even though we cannot
curlthe server addr,netstatstill shows the process listening. This will align the example with the hyper-util example in: https://github.com/hyperium/hyper-util/blob/e74ab7888638e768de17c47ed5f20c8b623a308f/examples/server_graceful.rs#L47