removed one of the ignored lines

vendor/splitbrain/php-archive/.travis.yml

-language: php
-
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - hhvm
-
-before_script:
-  - composer self-update
-  - composer install --prefer-source --no-interaction --dev
-
-script: phpunit
\ No newline at end of file