php 7.0.3 issue

[be-geeky]

Problem 1
- Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doctrine/instantiator[1.1.0].
- doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.23) does not satisfy that requirement.
Problem 2
- doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.23) does not satisfy that requirement.
- phpunit/phpunit-mock-objects 4.0.4 requires doctrine/instantiator ^1.0.5 -> satisfiable by doctrine/instantiator[1.1.0].
- Installation request for phpunit/phpunit-mock-objects 4.0.4 -> satisfiable by phpunit/phpunit-mock-objects[4.0.4].