run tests on Travis

.travis.yml

+language: go
+
+go:
+  - "1.10.x"
+  - "1.11.x"
+
+# first part of the GOARCH workaround
+# setting the GOARCH directly doesn't work, since the value will be overwritten later
+# so set it to a temporary environment variable first
+env:
+  - TRAVIS_GOARCH=amd64
+  - TRAVIS_GOARCH=386
+
+# second part of the GOARCH workaround
+# now actually set the GOARCH env variable to the value of the temporary variable set earlier
+before_install:
+  - make deps
+  - export GOARCH=$TRAVIS_GOARCH
+  - go env # for debugging
+
+script:
+  - ginkgo -r -v --cover --randomizeAllSpecs --randomizeSuites --trace --progress
+
+cache:
+  directories:
+    - $GOPATH/src/gx

Makefile

+gx:
+	go get github.com/whyrusleeping/gx
+	go get github.com/whyrusleeping/gx-go
+
+testutils:
+	go get golang.org/x/tools/cmd/cover
+	go get github.com/onsi/ginkgo/ginkgo
+	go get github.com/onsi/gomega
+
+deps: gx testutils
+	gx --verbose install --global
+	gx-go rewrite

README.md

@@ -5,6 +5,7 @@
 [![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](http://libp2p.io/)
 [![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
 [![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-tls?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-tls)
+[![Linux Build Status](https://img.shields.io/travis/libp2p/go-libp2p-tls/master.svg?style=flat-square&label=linux+build)](https://travis-ci.org/libp2p/go-libp2p-tls)
 
 > go-libp2p's TLS encrypted transport