Python example needs to be up to date

What problem did you encounter?

• example application

The Python example doesn't work. It makes reviews harder. Despite a C example being present (or so I'm told), there are a some factors making Python less hassle for reviewing:

• Python doesn't need a C compiler
• Python can be modified very quickly to check behaviours of the patch

What is the actual behaviour?

example.py fails:

purism@pureos:~$ python3 ./example.py 
(example.py:1751): Gtk-WARNING **: 13:23:20.802: Locale not supported by C library.
        Using the fallback 'C' locale.

(example.py:1751): dbind-WARNING **: 13:23:20.810: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
Traceback (most recent call last):
  File "./example.py", line 21, in <module>
    dialer = Handy.Dialer()
  File "/usr/lib/python3/dist-packages/gi/module.py", line 132, in __getattr__
    self.__name__, name))
AttributeError: 'gi.repository.Handy' object has no attribute 'Dialer'

What is the expected behaviour?

Not crashing

How to reproduce?

• Install .deb from CI, including gir
• python3 ./example.py

Which version did you encounter the bug in?

I used the precompiled Debian package from !363 (merged)

What hardware are you running libhandy on?

Either the emulator or the L5