Release v0.6.0

[kidunot89]

Release Summary

• Demo/Examples sections added to README.md
• More WooGraphQL + WPGraphQL extension integration bugfixes
• Connection resolver classes support all new WPGraphQL v0.6.0+ features
• Better cart validation and error messages
• Replaces unauthorized queries with authorized queries for unauthorized queries instead of return null. For example orders(...) {...} should default to customer{ orders(...) {...} } when user is not authorized to execute orders(...) {...}