Prepare Version 5.1.2

- Remove PHP_Timer dependency - issue #155
- Add phpunit 7 compability - issue #155
- Fix capacity cleanup simulation

src/Version.php

@@ -43,7 +43,7 @@ public static function id() : string
         }
 
         if (self::$version === null) {
-            $version = new SebastianBergmann\Version('5.1.1', dirname(dirname(__DIR__)));
+            $version = new SebastianBergmann\Version('5.1.2', dirname(dirname(__DIR__)));
             self::$version = $version->getVersion();
         }