method doesn't work

Here's the changelog of the last update: tostring() has ben removed in 3.0
https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst

Hello Luiz,

 What OS version are you using? In Ubuntu 15.04 the pil package version is:

 2.7.0-1 - python2.7-pil python-pillow

Hello! I'm using Arch
linux 4.2.2-1
python 2.7.10pillow 3.0qrtools 1.2-4> Date: Fri, 9 Oct 2015 13:33:28 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 1503759] Re: method doesn't work
>
> Hello Luiz,
>
> What OS version are you using? In Ubuntu 15.04 the pil package version
> is:
>
> 2.7.0-1 - python2.7-pil python-pillow
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1503759
>
> Title:
> method doesn't work
>
> Status in QR Tools:
> New
>
> Bug description:
> PIL has been updated. Just change "raw = pil.tostring()" to "raw =
> pil.tobytes()" at line 149
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qr-tools/+bug/1503759/+subscriptions

same in Ubuntu 16.04 LTS

Traceback (most recent call last):
  File "/usr/bin/qtqr", line 540, in decodeFile
    if qr.decode():
  File "/usr/lib/python2.7/dist-packages/qrtools.py", line 181, in decode
    raw = pil.tostring()
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 695, in tostring
    "Please call tobytes() instead.")
Exception: tostring() has been removed. Please call tobytes() instead.