v0.1.1

• Rename Wallet#subscriptions to Wallet.credit_subscriptions so that it doesn’t override the Pay gem’s own subscriptions association on User
• Add non-postgres fallbacks for PostgreSQL-only operations (namely @> to access json attributes)
• Add optional expires_at to give_credits so you can expire any batch of credits at any arbitrary date in the future
• Add Allocation associations to the Wallet model
• Add demo Rails app to showcase the gem features