added phpunit in vendor to .travis

Author: pavelvondrasek

.travis.yml

@@ -21,7 +21,7 @@ before_script:
   - if [[ "$PACKAGE_VERSION" == "high" ]]; then composer update --prefer-source; fi
   - if [[ "$PACKAGE_VERSION" == "low" ]]; then composer update --prefer-lowest --prefer-source; fi
 
-script: phpunit -c tests/phpunit.xml.dist
+script: php vendor/bin/phpunit -c tests/phpunit.xml.dist
 
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