Remove unnecessary step from travis build

Author: Riimu

.travis.yml

@@ -18,9 +18,6 @@ install:
   - travis_retry composer install --no-interaction
   - travis_retry wget https://scrutinizer-ci.com/ocular.phar
 
-before_script:
-  - mkdir -p build/logs
-
 script:
   - vendor/bin/phpunit --coverage-clover=coverage.clover
   - vendor/bin/phpcs --standard=PSR2 src tests