chore: migrate PHPUnit configuration and update badges (#352)

Author: alanpoulain

README.md

@@ -3,9 +3,9 @@
 `schema` is a command line tool part of [the API Platform framework](https://api-platform.com) that instantly generates a set
 of PHP classes from vocabularies such as (but not limited to) [Schema.org](https://schema.org)
 or [ActivityStreams](https://www.w3.org/TR/activitystreams-core/).
-[![Build Status](https://travis-ci.org/api-platform/schema-generator.svg?branch=master)](https://travis-ci.org/api-platform/schema-generator)
+
+[![GitHub Actions](https://github.com/api-platform/schema-generator/workflows/CI/badge.svg?branch=master)](https://github.com/api-platform/schema-generator/actions?query=workflow%3ACI+branch%3Amaster)
 [![Coverage Status](https://coveralls.io/repos/github/api-platform/schema-generator/badge.svg?branch=master)](https://coveralls.io/github/api-platform/schema-generator?branch=master)
-[![SensioLabsInsight](https://insight.sensiolabs.com/projects/87ec89e6-57cd-4ac0-9ab1-d4549c5425c5/mini.png)](https://insight.sensiolabs.com/projects/87ec89e6-57cd-4ac0-9ab1-d4549c5425c5)
 
 ## Documentation
 

phpunit.xml.dist

@@ -1,8 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.6/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          backupGlobals="false"
          colors="true">
@@ -12,15 +10,15 @@
         <server name="SYMFONY_DEPRECATIONS_HELPER" value="max[direct]=0" />
     </php>
 
-    <testsuites>
+    <coverage>
+        <include>
+            <directory>src</directory>
+        </include>
+    </coverage>
+
+     <testsuites>
         <testsuite name="Project Test Suite">
             <directory>tests</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
 </phpunit>