v0.5.6

Released to PyPI

• New Feature: ExifTool.set_json_loads() used to override built-in json.loads() call in ExifTool.execute_json(), so that users can use their JSON library of choice, or pass additional parameters to the call
• Changed: ujson is no longer automatically used when available. Call set_json_loads(ujson.loads) to enable manually.
• Docs: Updated FAQ set_json_loads with use case of ExifTool.set_json_loads(). The FAQ documents in detail the issue reported at #76 which necessitated the new feature.