Update readme with additional package to install

Readme.md

@@ -70,7 +70,7 @@ Detection and their measures are saved as fixations.csv, saccades.csv, persuits.
 # How to use
 Make sure the right packages are installed in your environment:
 ```bash
-pip install numpy pandas matplotlib liac-arff 
+pip install numpy pandas scipy matplotlib liac-arff 
 ```
 
 Detection is run by running the script main.py. Here you can set global parameters for running the detection:
@@ -90,4 +90,4 @@ trails          = 2                             # trails per participant
 filename        = 'varjo_gaze_output'           # looks for files with this string in the name
 ```
 
-The parameters for detection are specified in run_detection.py. 
+The parameters for detection are specified in run_detection.py.