- Reduce sending of unnecessary acks.
$ go version
go version go1.7.3 darwin/amd64
xtaci/smux@60c611f
xtaci/kcp-go@ffaad6e
229a4a8
MD5 (kcptun-linux-amd64-20161111.tar.gz) = ce253b046f0da77b4967aa3aff1b2964
MD5 (kcptun-linux-386-20161111.tar.gz) = 7de2cafc0241f2e5ef035f7a0ba98997
MD5 (kcptun-darwin-amd64-20161111.tar.gz) = 9d5bc96de9fcb8d482d96bafec9e2cfe
MD5 (kcptun-darwin-386-20161111.tar.gz) = 90226dd048926a5df76f5faa77d0a5eb
MD5 (kcptun-windows-amd64-20161111.tar.gz) = 319528d86bea95406d2a9674f0b709c0
MD5 (kcptun-windows-386-20161111.tar.gz) = 6b78544cd1ef53b2c2ea7a97bb01a596
MD5 (kcptun-freebsd-amd64-20161111.tar.gz) = 124082639403b5b70130033af75a4ffb
MD5 (kcptun-freebsd-386-20161111.tar.gz) = de05580146bce6e84942883e635a505f
MD5 (kcptun-linux-arm-20161111.tar.gz) = a3e8f15715a9add8396b3da2ebd2efae