Fixing mass-assignment issue
Fixing mass-assignment issue

manuca/Spree-Mercado-Pago-payment-method,devartis/Spree-Mercado-Pago-payment-method,juliobetta/spree_mercado_pago,juliobetta/spree_mercado_pago,devartis/Spree-Mercado-Pago-payment-method,felipekk/spree_mercado_pago,juliobetta/spree_mercado_pago,felipekk/spree_mercado_pago,manuca/spree_mercado_pago,felipekk/spree_mercado_pago,manuca/spree_mercado_pago,manuca/spree_mercado_pago,manuca/Spree-Mercado-Pago-payment-method,devartis/Spree-Mercado-Pago-payment-method