ver.1.2

• fixed errors while downloading videos (problem of pytube library, fixed by updating all imports)
• minor changes
• WARNING: if the app unexpectedly stops working and/or .exe file disappears, check your antivirus (Quarantine or log file). I'm still figuring way to convince antivirus SW that Q-Tube is safe to run. (If you don't trust the .exe file, you can review .py files and run it directly via Python)