added badges to website
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+ <p><a href="https://github.com/ElektraInitiative/libelektra/releases/latest"><img src="https://img.shields.io/github/release/ElektraInitiative/libelektra.svg" alt="Release" /></a>
+ <a href="https://build.libelektra.org/jenkins/job/libelektra/job/master/lastBuild"><img src="https://img.shields.io/jenkins/t/https/build.libelektra.org/jenkins/job/libelektra/job/master.svg" alt="Jenkins Build Status" /></a>
+ <a href="https://travis-ci.org/ElektraInitiative/libelektra"><img src="https://travis-ci.org/ElektraInitiative/libelektra.svg?branch=master" alt="Travis Build Status" /></a>
+ <a href="https://cirrus-ci.com/github/ElektraInitiative/libelektra"><img src="https://api.cirrus-ci.com/github/ElektraInitiative/libelektra.svg" alt="Cirrus Build Status" /></a>
+ <a href="https://coveralls.io/github/ElektraInitiative/libelektra"><img src="https://img.shields.io/coveralls/github/ElektraInitiative/libelektra.svg" alt="Coverage Status" /></a>
+ <a href="https://lgtm.com/projects/g/ElektraInitiative/libelektra/alerts"><img src="https://img.shields.io/lgtm/alerts/g/ElektraInitiative/libelektra.svg?logo=lgtm&amp;logoWidth=18" alt="Total alerts" /></a></p>
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