add protobuf, websocket, dns as vendor

.gitmodules

@@ -1,3 +1,12 @@
 [submodule "vendor/h12.me/socks"]
 	path = vendor/h12.me/socks
 	url = https://github.com/h12w/socks
+[submodule "vendor/github.com/golang/protobuf"]
+	path = vendor/github.com/golang/protobuf
+	url = https://github.com/golang/protobuf.git
+[submodule "vendor/github.com/miekg/dns"]
+	path = vendor/github.com/miekg/dns
+	url = https://github.com/miekg/dns.git
+[submodule "vendor/github.com/gorilla/websocket"]
+	path = vendor/github.com/gorilla/websocket
+	url = https://github.com/gorilla/websocket.git

vendor/github.com/golang/protobuf

@@ -0,0 +1 @@
+Subproject commit 2bba0603135d7d7f5cb73b2125beeda19c09f4ef

vendor/github.com/gorilla/websocket

@@ -0,0 +1 @@
+Subproject commit a91eba7f97777409bc2c443f5534d41dd20c5720

vendor/github.com/miekg/dns

@@ -0,0 +1 @@
+Subproject commit 6ebcb714d36901126ee2807031543b38c56de963