Add concurrency #6
We run the individual search-replace operations asyncronously, but use a buffered channel to ensure output remains in-order. Using a channel of channels, we syncronously put a chan string placeholder in the channel and send to it in a goroutine (async). To ensure we don't get stuck in deadlock, we use a waitgroup to close the channel (which effectively ends the master process) after all channels have been processed.
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