Fixed 'build' ant process, which require 'var-dump-check', but was not included in composer

Author: JakubOnderka

.travis.yml

@@ -15,6 +15,4 @@ before_script:
   - composer install --no-interaction --prefer-source
 
 script:
-  - ant phplint
-  - ant phpcs
-  - ant phpunit
+  - ant

composer.json

@@ -19,6 +19,7 @@
     "require-dev": {
         "phpunit/phpunit": "~4.0",
         "jakub-onderka/php-parallel-lint": "~0.5",
+        "jakub-onderka/php-var-dump-check": "~0.1",
         "squizlabs/php_codesniffer": "~1.5",
         "jakub-onderka/php-code-style": "~1.0"
     }