AttributeError: 'Bunch' object attribute 'values' is read-only

[femtotrader]

I took most recent fork
https://github.com/redodo/lunch/
and fork it https://github.com/femtotrader/lunch/
to add CI

https://travis-ci.org/femtotrader/lunch

I saw this with Python 3.3:
AttributeError: 'Bunch' object attribute 'values' is read-only

Any idea ?

0.11s$ python tests/test_bunch.py

---

File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/bunch/init.py", line 163, in bunch.Bunch.delattr
Failed example:
del b.values
Expected:
Traceback (most recent call last):
...
AttributeError: 'Bunch' object attribute 'values' is read-only
Got:
Traceback (most recent call last):
File "/opt/python/3.3.5/lib/python3.3/doctest.py", line 1313, in run
compileflags, 1), test.globs)
File "<doctest bunch.Bunch.__delattr[1]>", line 1, in
del b.values
File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/bunch/init.py", line 182, in delattr
object.delattr(self, k)
AttributeError: values

---

1 items had failures:
1 of 4 in bunch.Bunch.delattr
_Test Failed_ 1 failures.
The command "python tests/test_bunch.py" exited with 1.