Auto-Update submodule sample-code-php

Author: ashtru

.travis.yml

@@ -10,7 +10,7 @@ before_script:
     - pecl install xmldiff
     - composer install --prefer-dist --ignore-platform-reqs
     - chmod +x ./test-sample-codes.sh
-    - git submodule update --recursive
+    - git submodule update --remote --recursive 
 
 script:
     - vendor/phpunit/phpunit/phpunit --coverage-clover=coverage.clover