PHP7 compatibility

[JanisGruzis]

I get this problem

  Problem 1
    - jms/serializer 1.1.0 requires php >=5.4.0 -> your PHP version (7.0.2) overriden by "config.platform.php" version (5.3.9) does not satisfy that requirement.
    - jms/serializer 1.1.0 requires php >=5.4.0 -> your PHP version (7.0.2) overriden by "config.platform.php" version (5.3.9) does not satisfy that requirement.
    - jms/serializer 1.1.0 requires php >=5.4.0 -> your PHP version (7.0.2) overriden by "config.platform.php" version (5.3.9) does not satisfy that requirement.
    - Installation request for jms/serializer == 1.1.0.0 -> satisfiable by jms/serializer[1.1.0].

Maybe PHP version in composer should be changed.

from
>=5.4.0
to
>=5.4.0|~7.0

[JanisGruzis]

Ok. My bad. Had platform set in my composer file.

  "config": {
        "bin-dir": "bin",
        "platform": {
            "php": "5.3.9"
        }
    },