Merge "Upgrade justinrainbow/json-schema to ~3.0"

diff --combined composer.json
index 956739d,c8ed37e..2243b7c
--- 1/composer.json
--- 2/composer.json
+++ b/composer.json
@@@ -25,7 -25,7 +25,7 @@@
                "ext-xml": "*",
                "liuggio/statsd-php-client": "1.0.18",
                "mediawiki/at-ease": "1.1.0",
 -              "oojs/oojs-ui": "0.17.7",
 +              "oojs/oojs-ui": "0.17.8",
                "oyejorge/less.php": "1.7.0.10",
                "php": ">=5.5.9",
                "psr/log": "1.0.0",
@@@ -45,10 -45,10 +45,10 @@@
        },
        "require-dev": {
                "jakub-onderka/php-parallel-lint": "0.9.2",
-               "justinrainbow/json-schema": "~1.6",
+               "justinrainbow/json-schema": "~3.0",
                "mediawiki/mediawiki-codesniffer": "0.7.2",
                "monolog/monolog": "~1.18.2",
 -              "nikic/php-parser": "1.4.1",
 +              "nikic/php-parser": "2.1.0",
                "nmred/kafka-php": "0.1.5",
                "phpunit/phpunit": "4.8.24",
                "wikimedia/avro": "1.7.7"