Caching is only supported on PHP 5.5 or higher, make sure to skip tes…

…t on PHP 5.4

.travis.yml

@@ -9,11 +9,11 @@ php:
 
 before_script:
   - composer self-update
-  - composer update --prefer-source
+  - composer update --ignore-platform-reqs --prefer-source
   - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "memory_limit=2048M" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi
   - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ] && [ "$TRAVIS_PHP_VERSION" != "5.6" ]; then phpenv config-rm xdebug.ini; fi
 
-script: 
+script:
   - vendor/bin/phpcs --standard=PSR1,PSR2 -n src
   - if [ "$TRAVIS_PHP_VERSION" != "5.6" ]; then php bin/runner.php --show check; fi
   - if [ "$TRAVIS_PHP_VERSION" != "5.6" ]; then vendor/bin/phpunit; fi
@@ -24,4 +24,4 @@ after_script:
   - if [ "$TRAVIS_PHP_VERSION" = "5.6" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
   - if [ "$TRAVIS_PHP_VERSION" = "5.6" ]; then php ocular.phar code-coverage:upload --format=php-clover runner.xml; fi
   - if [ "$TRAVIS_PHP_VERSION" = "5.6" ]; then php ocular.phar code-coverage:upload --format=php-clover phpunit.xml; fi
-  - if [ "$TRAVIS_PHP_VERSION" = "5.6" ]; then travis_retry php vendor/bin/coveralls -v; fi
+  - if [ "$TRAVIS_PHP_VERSION" = "5.6" ]; then travis_retry php vendor/bin/coveralls -v; fi

tests/unit/CacheTest.php

@@ -10,6 +10,10 @@
  */
 class CacheTest extends PHPUnit_Framework_TestCase
 {
+    /**
+     * @requires PHP 5.5
+     */
+
     public function testCreatingParserWithoutArgumentsAndCallAnalyse()
     {
         function countCachedItems($pool) {