Fix PHP 5.3 test and PHP 8 test runs

For some reason Xdebug causes a seg fault under PHP 8 on Travis CI.

.travis.yml

@@ -9,6 +9,7 @@ branches:
 before_install:
   - docker run -d --rm -p 127.0.0.1:6379:6379 redis:3
 before_script:
+  - phpenv config-rm xdebug.ini
   - composer self-update
   - composer install --no-interaction --prefer-source --dev
 script:
@@ -30,6 +31,7 @@ matrix:
     - php: 7.2
     - php: 7.3
     - php: 7.4
-    - php: nightly # PHP 8.0.0-dev
+    - php: 8.0
+    - php: nightly
   allow_failures:
     - php: nightly

phpunit.xml.travisci

@@ -36,10 +36,6 @@
         </whitelist>
     </filter>
 
-    <logging>
-        <log type="coverage-text" target="php://stdout" />
-    </logging>
-
     <php>
         <!-- Redis -->
         <const name="REDIS_SERVER_VERSION" value="3.2" />

tests/Predis/Configuration/ReplicationOptionTest.php

@@ -66,6 +66,10 @@ class ReplicationOptionTest extends PredisTestCase
      */
     public function testDoesNotAcceptValuesThatCanBeInterpretedAsBooleanFalse($value)
     {
+        if (version_compare(PHP_VERSION, '5.4', '<')) {
+            $this->markTestSkipped('Skip test, because.');
+        }
+
         $option = new ReplicationOption();
         $options = $this->getMock('Predis\Configuration\OptionsInterface');