Issue #38: Add coverage.

.scrutinizer.yml

@@ -0,0 +1,8 @@
+build:
+  tests:
+    override:
+      -
+        command: './vendor/bin/phpunit --coverage-clover=report/clover.xml'
+        coverage:
+          file: 'report/clover.xml'
+          format: 'clover'

README.md

@@ -2,6 +2,7 @@
 
 [![Build Status](https://travis-ci.org/ec-europa/oe-poetry-client.svg?branch=master)](https://travis-ci.org/ec-europa/oe-poetry-client)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/ec-europa/oe-poetry-client/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/ec-europa/oe-poetry-client/?branch=master)
+[![Code Coverage](https://scrutinizer-ci.com/g/ec-europa/oe-poetry-client/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/ec-europa/oe-poetry-client/?branch=master)
 
 The Poetry Client Library aims to hide Poetry service complexity behind and easy-to-use client library so that
 users don't have to worry about building their own request messages nor implementing SOAP interactions.