Symfony3 compatibility (#2) * drop PHP 5.3 and 5.4 support * add travis tests for PHP 5.5+ * Support bicpi/html-converter `^2.0` * switch to PSR-4 * update README and docs * use PHPUnit as a dev dependency * Add travis build image branch restriction
Symfony3 compatibility (#2) * drop PHP 5.3 and 5.4 support * add travis tests for PHP 5.5+ * Support bicpi/html-converter `^2.0` * switch to PSR-4 * update README and docs * use PHPUnit as a dev dependency * Add travis build image branch restriction