Update README.md - remove .png from badge image URLs

README.md

@@ -6,10 +6,10 @@
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/paragonie/phpecc/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/paragonie/phpecc?branch=master)
 [![Code Coverage](https://scrutinizer-ci.com/g/paragonie/phpecc/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/phpecc/phpecc/?branch=master)
 
-[![Latest Stable Version](https://poser.pugx.org/paragonie/ecc/v/stable.png)](https://packagist.org/packages/paragonie/ecc)
-[![Total Downloads](https://poser.pugx.org/paragonie/ecc/downloads.png)](https://packagist.org/packages/paragonie/ecc)
-[![Latest Unstable Version](https://poser.pugx.org/paragonie/ecc/v/unstable.png)](https://packagist.org/packages/paragonie/ecc)
-[![License](https://poser.pugx.org/paragonie/ecc/license.png)](https://packagist.org/packages/paragonie/ecc)
+[![Latest Stable Version](https://poser.pugx.org/paragonie/ecc/v/stable)](https://packagist.org/packages/paragonie/ecc)
+[![Total Downloads](https://poser.pugx.org/paragonie/ecc/downloads)](https://packagist.org/packages/paragonie/ecc)
+[![Latest Unstable Version](https://poser.pugx.org/paragonie/ecc/v/unstable)](https://packagist.org/packages/paragonie/ecc)
+[![License](https://poser.pugx.org/paragonie/ecc/license)](https://packagist.org/packages/paragonie/ecc)
 
 ## Notice