Bump version to 1903
Bump version to 1903

eXcomm/gratipay.com,eXcomm/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,eXcomm/gratipay.com,gratipay/gratipay.com,eXcomm/gratipay.com,studio666/gratipay.com