Update docs

README.md

@@ -2,12 +2,12 @@
 
 [![Total Downloads](https://img.shields.io/packagist/dt/lcobucci/clock.svg?style=flat-square)](https://packagist.org/packages/lcobucci/clock)
 [![Latest Stable Version](https://img.shields.io/packagist/v/lcobucci/clock.svg?style=flat-square)](https://packagist.org/packages/lcobucci/clock)
+[![Unstable Version](https://img.shields.io/packagist/vpre/lcobucci/clock.svg?style=flat-square)](https://packagist.org/packages/lcobucci/clock)
+
 
-![Branch master](https://img.shields.io/badge/branch-master-brightgreen.svg?style=flat-square)
 [![Build Status](https://img.shields.io/travis/lcobucci/clock/master.svg?style=flat-square)](http://travis-ci.org/lcobucci/clock)
 [![Scrutinizer Code Quality](https://img.shields.io/scrutinizer/g/lcobucci/clock/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/lcobucci/clock/?branch=master)
 [![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/lcobucci/clock/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/lcobucci/clock/?branch=master)
-[![SensioLabsInsight](https://insight.sensiolabs.com/projects/50e3ef67-0f42-48fe-ace5-0beb9f78d117/mini.png)](https://insight.sensiolabs.com/projects/50e3ef67-0f42-48fe-ace5-0beb9f78d117)
 
 Yet another clock abstraction...
 
@@ -36,7 +36,7 @@ function filterData(Clock $clock, array $objects): array
 {
     return array_filter(
         $objects,
-        function (stdClass $object) use ($clock): bool {
+        static function (stdClass $object) use ($clock): bool {
             return $object->expiresAt > $clock->now();
         }
     );