Fix cs check command in travis config

Author: codeliner

.travis.yml

@@ -23,7 +23,7 @@ before_script:
 
 script:
   - if [[ $TEST_COVERAGE == 'true' ]]; then php -dzend_extension=xdebug.so ./vendor/bin/phpunit --coverage-text --coverage-clover ./build/logs/clover.xml; else ./vendor/bin/phpunit; fi
-  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/php-cs-fixer fix -v --diff --dry-run; fi
+  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/php-cs-fixer fix src -v --diff --dry-run; fi
   - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/docheader check examples/ src/ tests/; fi
 
 after_success: