Aggiunto coveralls

README.md

@@ -2,6 +2,7 @@
 
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/0ab2f441777d4160bfc2f6829bdcfc8c)](https://www.codacy.com/app/matteobaccan/html2pop3?utm_source=github.com&utm_medium=referral&utm_content=matteobaccan/html2pop3&utm_campaign=Badge_Grade)
 [![Language grade: Java](https://img.shields.io/lgtm/grade/java/g/matteobaccan/html2pop3.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/matteobaccan/html2pop3/context:java)
+[![Coverage Status](https://coveralls.io/repos/github/matteobaccan/html2pop3/badge.svg?branch=master)](https://coveralls.io/github/matteobaccan/html2pop3?branch=master)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/matteobaccan/html2pop3.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/matteobaccan/html2pop3/alerts/)
 [![Build Status](https://travis-ci.org/matteobaccan/html2pop3.svg?branch=master)](https://travis-ci.org/matteobaccan/html2pop3)
 [![security status](https://www.meterian.io/badge/gh/matteobaccan/html2pop3/security)](https://www.meterian.io/report/gh/matteobaccan/html2pop3)