minor #2286 [React] Update phpunit.xml.dist (smnandre)

This PR was merged into the 2.x branch.

Discussion
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[React] Update phpunit.xml.dist

(minor)

Commits
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7baea71 Update React phpunit.xml.dist

src/React/phpunit.xml.dist

@@ -1,13 +1,18 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.1/phpunit.xsd"
-         backupGlobals="false"
+         xsi:noNamespaceSchemaLocation="vendor/bin/.phpunit/phpunit.xsd"
          colors="true"
          bootstrap="vendor/autoload.php"
          failOnRisky="true"
          failOnWarning="true">
+
+    <coverage processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+    </coverage>
+
     <php>
         <ini name="error_reporting" value="-1" />
         <ini name="intl.default_locale" value="en" />
@@ -23,9 +28,4 @@
         </testsuite>
     </testsuites>
 
-    <filter>
-        <whitelist>
-            <directory>./src</directory>
-        </whitelist>
-    </filter>
 </phpunit>