use correct command for sandbox_mode in readme

ombulabs / mercadopago

Gem to communicate with the MercadoPago API

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Closed sirkosi closed 8 years ago

sirkosi commented 8 years ago

this fixes the sandbox usage described in readme

srabuini commented 8 years ago

:+1:

etagwerker commented 8 years ago

@schmierkov Awesome, thanks! :+1: