Update Tools.md
I might be wrong with pillow, but for me it kicked off with `ERROR: No matching distribution found for PIL` which was resolved with installing pillow.
In my very limited experience with python though, I seem to remember pillow being deprecated.. ? Either way, this fixed my error.
@@ -11,7 +11,7 @@ Have a look into the script for further details regarding the formats.
### Prerequisites:
``` shell
-sudo python3 -m pip install construct bitarray bitstring
+sudo python3 -m pip install construct bitarray bitstring pillow
```
### Usage:
