Add XSD specs for phpunit.xml.dist

composer.json

@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "kylekatarnls/multi-tester": "^1.1",
-        "phpunit/phpunit": "^6.4"
+        "phpunit/phpunit": "^6.5"
     },
     "autoload": {
         "psr-4": {

phpunit.xml.dist

@@ -1,14 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php"
-         backupGlobals="false"
-         backupStaticAttributes="false"
-         colors="true"
-         verbose="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false">
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
+    bootstrap="vendor/autoload.php"
+    colors="true"
+    verbose="true"
+>
     <testsuites>
         <testsuite name="Spatie Test Suite">
             <directory>tests</directory>
@@ -22,7 +19,7 @@
     <logging>
         <log type="tap" target="build/report.tap"/>
         <log type="junit" target="build/report.junit.xml"/>
-        <log type="coverage-html" target="build/coverage" charset="UTF-8" yui="true" highlight="true"/>
+        <log type="coverage-html" target="build/coverage"/>
         <log type="coverage-text" target="build/coverage.txt"/>
         <log type="coverage-clover" target="build/logs/clover.xml"/>
     </logging>