Simplify PHPUnit configuration

Author: spawnia

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
-         bootstrap="tests/bootstrap.php">
+         bootstrap="vendor/autoload.php">
   <php>
     <ini name="error_reporting" value="E_ALL"/>
   </php>
@@ -12,7 +12,7 @@
   </source>
   <testsuites>
     <testsuite name="webonyx/graphql-php Test Suite">
-      <directory>tests/</directory>
+      <directory>tests</directory>
     </testsuite>
   </testsuites>
 </phpunit>