1.0.0: Merge pull request #3 from abacaphiliac/php-compat

cicd(php): test newest php versions, and drop support for oldest versions

0.1.1: Merge pull request #2 from abacaphiliac/json-schema-validator

prevent re-encoding of JSON previously decoded to object (\stdClass).

0.1.0: Merge pull request #1 from abacaphiliac/json-schema-validator

add json-schema zf2-validator, via justinrainbow/json-schema.