vendor: add github.com/xtaci/smux

Godeps/Godeps.json

@@ -1,6 +1,6 @@
 {
 	"ImportPath": "github.com/fatedier/frp",
-	"GoVersion": "go1.6",
+	"GoVersion": "go1.8",
 	"GodepVersion": "v79",
 	"Packages": [
 		"./..."
@@ -30,6 +30,11 @@
 			"Comment": "v1.1-41-g8a45e95",
 			"Rev": "8a45e95fc75cb77048068a62daed98cc22fdac7c"
 		},
+		{
+			"ImportPath": "github.com/pkg/errors",
+			"Comment": "v0.8.0-5-gc605e28",
+			"Rev": "c605e284fe17294bda444b34710735b29d1a9d90"
+		},
 		{
 			"ImportPath": "github.com/pmezard/go-difflib/difflib",
 			"Comment": "v1.0.0",
@@ -49,6 +54,11 @@
 			"ImportPath": "github.com/vaughan0/go-ini",
 			"Rev": "a98ad7ee00ec53921f08832bc06ecf7fd600e6a1"
 		},
+		{
+			"ImportPath": "github.com/xtaci/smux",
+			"Comment": "v1.0.5-8-g2de5471",
+			"Rev": "2de5471dfcbc029f5fe1392b83fe784127c4943e"
+		},
 		{
 			"ImportPath": "golang.org/x/crypto/pbkdf2",
 			"Rev": "1f22c0103821b9390939b6776727195525381532"