add php7 to requirements, as you declare strict types

[lauripiisang]

Core of the problem:

php53 -a
Interactive shell

php > declare(strict_types=1);
PHP Warning:  Unsupported declare 'strict_types' in php shell code on line 1

Warning: Unsupported declare 'strict_types' in php shell code on line 1

[prewk]

Thanks, I added them to the composer.json requirements. Forgot about it.