Recommend settin warning=FALSE in r chunk

This way, warning show up in the console when rendering

index.md

 **xaringanthemer** and try one of the [theme functions](#themes).
 
 ```` markdown
-```{r xaringan-themer, include = FALSE}
+```{r xaringan-themer, include=FALSE, warning=FALSE}
 library(xaringanthemer)
 style_mono_accent(
   base_color = "#1c5253",

inst/rmarkdown/templates/xaringanthemer/skeleton/skeleton.Rmd

 options(htmltools.dir.version = FALSE)
 ```
 
-```{r xaringan-themer, include=FALSE}
+```{r xaringan-themer, include=FALSE, warning=FALSE}
 library(xaringanthemer)
 style_duo_accent(
   primary_color = "#1381B0",

man/fragments/_quick-intro.Rmd

 Then, in a hidden chunk just after the knitr setup chunk, load **xaringanthemer** and try one of the [theme functions][theme-functions].
 
 ````markdown
-```{r xaringan-themer, include = FALSE}`r ""`
+```{r xaringan-themer, include=FALSE, warning=FALSE}`r ""`
 library(xaringanthemer)
 style_mono_accent(
   base_color = "#1c5253",

vignettes/ggplot2-themes.Rmd

 that we're not using the standard default fonts.
 
 ````markdown
-```{r xaringan-themer, include=FALSE}`r ''`
+```{r xaringan-themer, include=FALSE, warning=FALSE}`r ''`
 library(xaringanthemer)
 style_mono_accent(
   base_color = "#DC322F",               # bright red