Update Exercise_8_solutions.md

Author: jonbra

exercises/solutions/Exercise_8_solutions.md

@@ -1,5 +1,5 @@
 Basic plotting
-NB: remember to run `library(tidyverse)` and `library(ggplot2)`  
+NB: remember to run `library(tidyverse)` 
 
 - Make a scatterplot showing the relationship between gene length and count in the data located in "data_file_1.csv". Bonus: Can you change the names of the x and y axes?
 ```{r}