Como suprimo essa saída?
Eu tenho um pedaço de código em um arquivo R Markdown.
```{r}
library(UsingR)
```
O uso do knitHTML para compilar causa a seguinte saída, que nunca aconteceu antes da atualização para as versões mais recentes do R e RStudio:
## Loading required package: MASS
## Loading required package: HistData
## Loading required package: Hmisc
## Loading required package: grid
## Loading required package: lattice
## Loading required package: survival
## Loading required package: splines
## Loading required package: Formula
##
## Attaching package: 'Hmisc'
##
## The following objects are masked from 'package:base':
##
## format.pval, round.POSIXt, trunc.POSIXt, units
##
## Loading required package: aplpack
## Loading required package: tcltk
## Loading required package: quantreg
## Loading required package: SparseM
##
## Attaching package: 'SparseM'
##
## The following object is masked from 'package:base':
##
## backsolve
##
##
## Attaching package: 'quantreg'
##
## The following object is masked from 'package:Hmisc':
##
## latex
##
## The following object is masked from 'package:survival':
##
## untangle.specials
##
##
## Attaching package: 'UsingR'
##
## The following object is masked from 'package:survival':
##
## cancer
Como posso suprimir essa saída? Nota: echo = FALSE não funcionou.