[CLEANUP] Move the PHPUnit configuration file (#99)

This will bring the project closer to the default Symfony
project structure.

Author: oliverklee

.github/CONTRIBUTING.md

@@ -79,7 +79,7 @@ code coverage of the fixed bugs and the new features.
 To run the existing unit tests, run this command:
 
 ```bash
-vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Unit/
+vendor/bin/phpunit tests/Unit/
 ```
 
 ### Running the integration tests

.travis.yml

@@ -66,12 +66,12 @@ script:
 - >
   echo;
   echo "Running the unit tests";
-  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Unit/;
+  vendor/bin/phpunit tests/Unit/;
 
 - >
   echo;
   echo "Running the integration tests";
-  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Integration/;
+  vendor/bin/phpunit tests/Integration/;
 
 - >
   echo;

CHANGELOG.md

@@ -13,6 +13,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - REST action for getting all subscribers for a list (#83)
 
 ### Changed
+- Move the PHPUnit configuration file (#99)
 - Use the renamed phplist/core package (#97)
 - Adopt more of the default Symfony project structure (#92, #93, #94, #95)
 

Configuration/PHPUnit/phpunit.xml phpunit.xml.distConfiguration/PHPUnit/phpunit.xml renamed to phpunit.xml.dist

@@ -5,7 +5,7 @@
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.2/phpunit.xsd"
          backupGlobals="false"
          colors="true"
-         bootstrap="../../vendor/autoload.php"
+         bootstrap="vendor/autoload.php"
 >
     <php>
         <ini name="error_reporting" value="-1"/>