Update TravisCI config

Author: tomphp

.travis.yml

@@ -13,9 +13,7 @@ install:
   - composer install --prefer-source
 
 script:
-  - vendor/bin/phpcs --standard=psr2 src tests
-  - vendor/bin/php-cs-fixer fix --verbose --dry-run src tests
-  - vendor/bin/phpunit
+  - composer ci
 
 matrix:
   fast_finish: true