gitlab-org/gitlab-ci-multi-runner#1478 Fixed phpunit command in the official doc didn't work.

Curl command has to follow redirects now.

doc/ci/examples/php.md

@@ -49,7 +49,7 @@ apt-get update -yqq
 apt-get install git -yqq
 
 # Install phpunit, the tool that we will use for testing
-curl -o /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
+curl -Lo /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
 chmod +x /usr/local/bin/phpunit
 
 # Install mysql driver