Added coverage reporting to CI pipeline, added badge for coveralls.io

.travis.yml

@@ -1,8 +1,9 @@
 language: go
-
 go:
   - stable
-
+before_install:
+  - go get -u github.com/mattn/goveralls
 script:
-  - go test -v -race ./...
+  - go test -v -race -covermode=count -coverprofile=profile.cov ./...
   - go vet ./...
+  - goveralls -coverprofile=provile.cov -service=travis-ci

README.md

@@ -2,6 +2,7 @@
 [![GoDoc](https://godoc.org/github.com/mrobinsn/go-newznab/newznab?status.svg)](https://godoc.org/github.com/mrobinsn/go-newznab/newznab)
 [![Go Report Card](https://goreportcard.com/badge/github.com/mrobinsn/go-newznab)](https://goreportcard.com/report/github.com/mrobinsn/go-newznab)
 [![Build Status](https://travis-ci.org/mrobinsn/go-newznab.svg?branch=master)](https://travis-ci.org/mrobinsn/go-newznab)
+[![Coverage Status](https://coveralls.io/repos/github/mrobinsn/go-newznab/badge.svg?branch=master)](https://coveralls.io/github/mrobinsn/go-newznab?branch=master)
 [![MIT license](http://img.shields.io/badge/license-MIT-brightgreen.svg)](http://opensource.org/licenses/MIT)