Updater doesn't consistently work

I don't have python2 installed so calling `python` in my terminal returns `command not found`. To start python, I need to call `python3`. I needed to change
```python
update_success_status |= os.system('cd /tmp/{0}/ && sudo python setup.py install'.format(source_folder))
```
to this:
```python
update_success_status |= os.system('cd /tmp/{0}/ && sudo python3 setup.py install'.format(source_folder))
```
to get the program to update correctly. (these edits are on main.py)

Possible solution:
use `sys.version` to get the version of python that is currently running and use the proper command