feat: support SCTP & UDP as endpoint type (#352)

* feat: support SCTP & UDP as endpoint type

* update README

* modify endpoint type test for sctp & udp

vendor/github.com/ishidawataru/sctp/.gitignore

@@ -0,0 +1,16 @@
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+
+example/example