ex04

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Exercise 8.4 (P239)

Modify the reverb2 server to use a sync.WaitGroup per connection to count the number of active echo goroutines. When it falls to zero, close the write half of the TCP connection as described in Exercise 8.3. Verify that your modified netcat3 client from that exercise waits fro the final echos of multiple concurrent shouts, even after the standard input has been closed.