add websocket as submodule

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "vendor/h12.me/socks"]
 	path = vendor/h12.me/socks
 	url = https://github.com/h12w/socks
+[submodule "vendor/websocket"]
+	path = vendor/websocket
+	url = https://www.github.com/v2ray/websocket

vendor/websocket

@@ -0,0 +1 @@
+Subproject commit 21ab95fa12b9bdd8fecf5fa3586aad941cc98785