added scott ritchie to contributors in description
added scott ritchie to contributors in description

jangorecki/data.table,jangorecki/data.table,vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,jangorecki/data.table,Rdatatable/data.table,Rdatatable/data.table,vlulla/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table