Use mod vendor for vendored directory (backwards compatible)

vendor/github.com/matterbridge/gomatrix/.gitignore

@@ -0,0 +1,24 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/matterbridge/gomatrix/.travis.yml

@@ -0,0 +1,9 @@
+language: go
+go:
+ - 1.8
+install:
+ - go get github.com/golang/lint/golint
+ - go get github.com/fzipp/gocyclo
+ - go get github.com/client9/misspell/...
+ - go get github.com/gordonklaus/ineffassign
+script: ./hooks/pre-commit

vendor/github.com/matterbridge/gomatrix/README.md

@@ -0,0 +1,6 @@
+# gomatrix
+[![GoDoc](https://godoc.org/github.com/matrix-org/gomatrix?status.svg)](https://godoc.org/github.com/matrix-org/gomatrix)
+
+A Golang Matrix client.
+
+**THIS IS UNDER ACTIVE DEVELOPMENT: BREAKING CHANGES ARE FREQUENT.**