see issue:
golang/go#16272
_(if you are not macOS Sierra(10.12) user, you don't need to upgrade to this one.)_
_(compiler:go version go1.7rc2 darwin/amd64)_
MD5 (kcptun-linux-amd64-20160719.tar.gz) = e662553cc2ebb1d47e90b4fe2154c02b
MD5 (kcptun-linux-386-20160719.tar.gz) = 765de2a1e9f8f301eba6ba00e4aeb29f
MD5 (kcptun-darwin-amd64-20160719.tar.gz) = b7d96aa30d0849652df2ff6036d9bb3e
MD5 (kcptun-darwin-386-20160719.tar.gz) = dc6d0a0cbeb865d491319a1f37ccb68b
MD5 (kcptun-windows-amd64-20160719.tar.gz) = bd77b5a11c29283e162343c35fd34a07
MD5 (kcptun-windows-386-20160719.tar.gz) = eb8e30bbbc506d2a8074e387a6c8ac70
MD5 (kcptun-freebsd-amd64-20160719.tar.gz) = 676f54bdb579d43752b203c034abd7a0
MD5 (kcptun-freebsd-386-20160719.tar.gz) = 08ed17b13b245c9bbcb13014d2ea9e16
MD5 (kcptun-linux-arm-20160719.tar.gz) = 684816b2b43bc05fa0f932862bf2b6f1