Drop testing on PHP < 5.6

Update dependencies and badges

.travis.yml

@@ -1,9 +1,8 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
+  - 7.0
   - hhvm
 
 before_script:

README.md

@@ -1,4 +1,9 @@
-[![Build Status](https://travis-ci.org/renekorss/Banklink.svg?branch=master)](https://travis-ci.org/renekorss/Banklink) [![Coverage Status](https://coveralls.io/repos/renekorss/Banklink/badge.svg?branch=master&service=github)](https://coveralls.io/github/renekorss/Banklink?branch=master) [![License](http://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+[![Build Status](https://travis-ci.org/renekorss/Banklink.svg?branch=master)](https://travis-ci.org/renekorss/Banklink) 
+[![Coverage Status](https://coveralls.io/repos/renekorss/Banklink/badge.svg?branch=master&service=github)](https://coveralls.io/github/renekorss/Banklink?branch=master)
+[![HHVM Status](http://hhvm.h4cc.de/badge/renekorss/banklink.svg?style=flat)](http://hhvm.h4cc.de/package/renekorss/banklink)
+[![Latest Stable Version](https://poser.pugx.org/renekorss/banklink/v/stable)](https://packagist.org/packages/renekorss/banklink)
+[![Total Downloads](https://poser.pugx.org/renekorss/banklink/downloads)](https://packagist.org/packages/renekorss/banklink)
+[![License](http://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 
 # PHP Banklink library
 

composer.json

@@ -16,7 +16,7 @@
     "lib-openssl": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "4.8.*",
+    "phpunit/phpunit": "5.1.*",
     "phpdocumentor/phpdocumentor": "dev-master",
     "satooshi/php-coveralls": "dev-master"
   },