add travis

.travis.yml

@@ -0,0 +1,8 @@
+language: go
+
+go:
+  - "1.12"
+
+env:
+  - GO111MODULE=on
+

README.md

@@ -1,4 +1,4 @@
-# go-dht
+# go-dht [![Go Report Card](https://goreportcard.com/badge/github.com/arnaucube/go-dht)](https://goreportcard.com/report/github.com/arnaucube/go-dht) [![Build Status](https://travis-ci.org/arnaucube/go-dht.svg?branch=master)](https://travis-ci.org/arnaucube/go-dht)
 
 Kademlia DHT Go implementation.