Cannot launch qreator

Linux Mint 19.3 (Ubuntu 18.04)
qreator 16.06.1-2

I cannot launch qreator. I have found like similar bug was already fixed (#1771122). Anyway, this is what I see:

```
$ qreator
/usr/share/qreator/qreator_lib/Builder.py:21: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import GObject, Gtk # pylint: disable=E0611
Traceback (most recent call last):
  File "/usr/bin/qreator", line 45, in <module>
    import qreator
  File "/usr/share/qreator/qreator/__init__.py", line 22, in <module>
    from qreator import QreatorWindow
  File "/usr/share/qreator/qreator/QreatorWindow.py", line 30, in <module>
    from QRCode import QRCode
  File "/usr/share/qreator/qreator/QRCode.py", line 23, in <module>
    import Image
ImportError: No module named Image
```

I installed qreator with "apt install qreator"

```
$ python -V
Python 2.7.17
$ python3 -V
Python 3.6.9
```