Update scripts README

scripts/README.md

@@ -1,19 +1,17 @@
 This folder contains scripts that can be used in combination with hyperfines `--export-json` option.
 
-### Pre-requisites
-
-To make theses scripts work, you will need matplotlib installed. Just execute the following commands:
-
-```bash
-pip install matplotlib
-
-# If you're using python 3
-pip3 install matplotlib
-```
-
 ### Example:
 
 ``` bash
 > hyperfine 'sleep 0.020' 'sleep 0.021' 'sleep 0.022' --export-json sleep.json
 > python plot_benchmark_results.py sleep.json
 ```
+
+### Pre-requisites
+
+To make these scripts work, you will need to install `numpy` and `matplotlib`. Install them via
+your package manager or `pip`:
+
+```bash
+pip install numpy matplotlib  # pip3, if you are using python3
+```