Update and fix phpunit

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

composer.json

@@ -18,7 +18,7 @@
     },
 
     "require-dev": {
-        "phpunit/phpunit": "^4.5"
+        "phpunit/phpunit": "^5.7"
     },
 
     "autoload": {

phpunit.sh

-vendor\bin\phpunit --bootstrap app\tests\bootstrap.php app/tests
\ No newline at end of file
+#!/usr/bin/env bash
+vendor/bin/phpunit --bootstrap app/tests/bootstrap.php app/tests