minor typo fix

Author: trevorcampbell

viz.Rmd

@@ -188,7 +188,7 @@ understand and remember your message quickly.
 This section will cover examples of how to choose and refine a visualization
 given a data set and a question that you want to answer, and then how to create
 the visualization in R \index{ggplot} using the `ggplot2` R package. Given that
-the `ggplot2`package is loaded by the `tidyverse` metapackage, we still 
+the `ggplot2` package is loaded by the `tidyverse` metapackage, we still 
 need to load only `tidyverse':
 
 ```{r 03-tidyverse, warning=FALSE, message=FALSE}