fix file path case again

Author: fawda123

index.Rmd

@@ -383,7 +383,7 @@ The plots in this dashboard are interactive and display options can be controlle
 
 <br>
 ```{r, fig.align='center', out.width='30%'}
-knitr::include_graphics('www/plotcontrols.png')
+knitr::include_graphics('www/plotcontrols.PNG')
 ```
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