Update README.md

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@@ -183,7 +183,11 @@ A: A standalone `agent` or `gate` server for running kcp-go is suggested, not on
Q: When should I enable FEC?
A: Forward error correction is critical for long-distance transmission, because a packet loss will leads to a huge penalty in time. And for the complicated packet routing network in modern world, round-trip time based loss check will not always be efficient, the big deviation of rtt samples in the long way usually leads to a larger RTO value in typical rtt estimator, which in other words, slows down the transmission.
A: Forward error correction is critical for long-distance transmission, because a packet loss will leads to a huge penalty in time. And for the complicated packet routing network in modern world, round-trip time based loss check will not always be efficient, the big deviation of rtt samples in the long way usually leads to a larger RTO value in typical rtt estimator, which in other words, slows down the transmission.
Q: Should I enable encryption?
A: Yes, for the safety of protocol.
## Who is using this?