sys issue and PSF Logo (#21)

* missing sys import was causing problems in the exe version

* added Supporting Python Logo

Co-authored-by: Marco Simone Zuppone <m.zuppone@computer.org>

Author: mszeu

README.md

@@ -6,7 +6,7 @@ Source License</b> for free with the full access to their developer suite.
 <a href="https://www.jetbrains.com/pycharm/?from=PayshieldPPressureTesPyCharm">PyCharm</a> is an awesome Python IDE that
 greatly simplified my work.
 
-&nbsp;
+<img src=images/supporting-member-badge.png width=100>
 
 The **pressureTest.py** Python script creates a workload on the **Thales payShield 10k** and **9k** appliances.  
 The script can be useful during demonstrations of the monitoring features of the appliance and can be used in every case

images/supporting-member-badge.png

@@ -12,8 +12,9 @@
 from pathlib import Path
 from typing import Tuple, Dict
 from types import FunctionType
+from sys import exit  # it prevents issues if the exit() function is invoked in the executable version
 
-VERSION = "1.1.7.2"
+VERSION = "1.1.7.3"
 
 
 def decode_n0(response_to_decode: bytes, head_len: int):