Updates `games_by_platform` and `platform` responses

1.1.0

• Adds page parameter to games_by_platform_id and includes boxart.
• Adds all available fields from Platforms in platforms, updates tests. Changes :slug to :alias in platforms response, to map to same response from API.
• Refactored json_response to use includes and extra data from the API response

Changes in 1.0.0

• Updated to new API endpoint, API key is now required to use the gem. Request an API Key here.
• Legacy API no longer supported since it's been shutdown.
• Since the API has changed, some endpoints are no longer supported and some new ones are supported.
• Removed ox dependency, the new API returns JSON instead of XML.

Check the CHANGELOG for other changes.

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