Merge pull request #99 from boardbang/issue-98

json-schema to v3

Author: Jamie Hannaford

composer.json

@@ -32,7 +32,7 @@
     "require": {
         "php": "~7.0",
         "guzzlehttp/guzzle": "~6.1",
-        "justinrainbow/json-schema": "~1.3"
+        "justinrainbow/json-schema": "~3.0.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",