suppress messages on loading its

On loading the package: its, I get the "Creating a new generic
function for" messages below even when I wrap the call with
capture.output. Is there a way to suppress these messages?

dummy=capture.output( library(its) )

Creating a new generic function for 'names' in 'its'
Creating a new generic function for 'names<-' in 'its'
Creating a new generic function for 'print' in 'its'
Creating a new generic function for 'start' in 'its'
Creating a new generic function for 'end' in 'its'
Creating a new generic function for 'summary' in 'its'
Creating a new generic function for 'diff' in 'its'
Creating a new generic function for 'union' in 'its'
Creating a new generic function for 'intersect' in 'its'