README: Add Travis build status

This adds a Travis build status badge to the README file, so the current status can be seen on the GitHub page instantly.
Yubico · May 2, 2018 · 4427abb · 4427abb
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 == Yubico PAM module
+image:https://travis-ci.org/Yubico/yubico-pam.svg?branch=master["Build Status", link="https://travis-ci.org/Yubico/yubico-pam"]
 
 The Yubico PAM module provides an easy way to integrate the Yubikey
 into your existing user authentication infrastructure.  PAM is used by