ggplot with hebrew title in rmardown

rmd_ggplot_hebrew.rmd

---
title: "Untitled"
output: html_document
---

```{r}
Sys.setlocale(locale="Hebrew" )
encoding="UTF-8"
```

```{r}
library(ggplot2)
ggplot(diamonds, aes(x=carat))+
geom_bar()+
labs(title="שלום על ישראל")
```