Update command to build runSciBot.exe

- as one has to specifiy the --windowed option to prevent the exe
  from opening a terminal.

Author: gregcorbett

README.md

@@ -24,7 +24,7 @@ pip install -r requirements.txt
 ### Building the runSciBot.exe file
 If you wish to build a new `runSciBot.exe` file, run the following command:
 ```
-pyinstaller -F runSciBot.py
+pyinstaller --windowed -F runSciBot.py
 ```
 
 ## Image Sources