Update phpunit config file

Author: halivert

.gitignore

@@ -1,3 +1,4 @@
 /vendor/
 *cache
 routes.js
+*.bak

phpunit.xml.dist

@@ -1,29 +1,29 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-	backupStaticAttributes="false"
-	beStrictAboutTestsThatDoNotTestAnything="false"
-	bootstrap="vendor/autoload.php"
-	colors="true"
-	convertErrorsToExceptions="true"
-	convertNoticesToExceptions="true"
-	convertWarningsToExceptions="true"
-	processIsolation="false"
-	stopOnFailure="false"
-	verbose="true">
-
-	<testsuites>
-		<testsuite name="Laravel JS Routes Test Suite">
-			<directory suffix="Test.php">./tests/</directory>
-		</testsuite>
-	</testsuites>
-	<filter>
-		<whitelist processUncoveredFilesFromWhitelist="true">
-			<directory suffix=".php">./src/</directory>
-		</whitelist>
-	</filter>
-
-	<php>
-		<server name="APP_ENV" value="testing"/>
-		<server name="APP_KEY" value="AckfSECXIvnK5r28GVIWUAxmbBSjTsmF"/>
-	</php>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  backupGlobals="false"
+  backupStaticAttributes="false"
+  beStrictAboutTestsThatDoNotTestAnything="false"
+  bootstrap="vendor/autoload.php"
+  colors="true"
+  convertErrorsToExceptions="true"
+  convertNoticesToExceptions="true"
+  convertWarningsToExceptions="true"
+  processIsolation="false"
+  stopOnFailure="false"
+  verbose="true"
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src/</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Laravel JS Routes Test Suite">
+      <directory suffix="Test.php">./tests/</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <server name="APP_ENV" value="testing"/>
+    <server name="APP_KEY" value="AckfSECXIvnK5r28GVIWUAxmbBSjTsmF"/>
+  </php>
 </phpunit>