Fixed an issue that was causing partitionName, a valid request parameter for createOrUpdateLeads to be stripped from the guzzle request when it is built.
Fixed an issue that was causing partitionName, a valid request parameter for createOrUpdateLeads to be stripped from the guzzle request when it is built.

dchesterton/marketo-rest-api,davegreco/marketo-rest-api,tomterryiv/marketo-rest-api