add coverall ci

.travis.yml

@@ -1,5 +1,10 @@
 language: go
 services:
   - docker
+before_install:
+  - go get golang.org/x/tools/cmd/cover
+  - go get github.com/mattn/goveralls
 script:
+  - go test -v -covermode=count -coverprofile=coverage.out ./... || echo go test failed
+  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_TOKEN
   - make

README.md

@@ -1,6 +1,8 @@
 # Bifrost
 
 [![Build Status](https://semaphoreci.com/api/v1/firemiles/bifrost-3/branches/master/shields_badge.svg)](https://semaphoreci.com/firemiles/bifrost-3)
+[![Build Status](https://travis-ci.com/firemiles/bifrost.svg?branch=master)](https://travis-ci.com/firemiles/bifrost)
+[![Coverage Status](https://coveralls.io/repos/github/firemiles/bifrost/badge.svg?branch=master)](https://coveralls.io/github/firemiles/bifrost?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/firemiles/bifrost)](https://goreportcard.com/report/github.com/firemiles/bifrost)
 
 In Norse mythology, Bifröst is a burning rainbow bridge that reaches between Midgard (Earth) and Asgard, the realm of the gods