add travis build

.travis.yml

@@ -0,0 +1,9 @@
+language: go
+sudo: false
+go_import_path: github.com/go-session/echo-session
+go:
+  - 1.9
+before_install:
+  - go get github.com/mattn/goveralls
+script:
+  - $HOME/gopath/bin/goveralls -service=travis-ci

README.md

@@ -1,6 +1,6 @@
 # Session middleware for [Echo](https://github.com/labstack/echo)
 
-[![ReportCard][reportcard-image]][reportcard-url] [![GoDoc][godoc-image]][godoc-url] [![License][license-image]][license-url]
+[![Build][Build-Status-Image]][Build-Status-Url] [![Coverage][Coverage-Image]][Coverage-Url] [![ReportCard][reportcard-image]][reportcard-url] [![GoDoc][godoc-image]][godoc-url] [![License][license-image]][license-url]
 
 ## Quick Start
 
@@ -73,6 +73,10 @@ $ ./server
 
     Copyright (c) 2018 Lyric
 
+[Build-Status-Url]: https://travis-ci.org/go-session/echo-session
+[Build-Status-Image]: https://travis-ci.org/go-session/echo-session.svg?branch=master
+[Coverage-Url]: https://coveralls.io/github/go-session/echo-session?branch=master
+[Coverage-Image]: https://coveralls.io/repos/github/go-session/echo-session/badge.svg?branch=master
 [reportcard-url]: https://goreportcard.com/report/github.com/go-session/echo-session
 [reportcard-image]: https://goreportcard.com/badge/github.com/go-session/echo-session
 [godoc-url]: https://godoc.org/github.com/go-session/echo-session