breaking on python 2;

This seems to be breaking on python 2.

>>> import beautifultable
>>> t = beautifultable.BeautifulTable()
>>> t.column_headers = ["a", "b", "c"]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/russ/.pyenv/versions/2.7.10/lib/python2.7/site-packages/beautifultable/beautifultable.py", line 231, in __setattr__
    super(BeautifulTable, self).__setattr__(name, value)
  File "/Users/russ/.pyenv/versions/2.7.10/lib/python2.7/site-packages/beautifultable/beautifultable.py", line 366, in column_headers
    raise TypeError("Headers should be of type 'str', not {}".format(type(i)))
TypeError: Headers should be of type 'str', not <type 'str'>

[pri22296]

@jayvdb Python2 support will be dropped in the next release. It’s going EOL so there is no point in suporting it. I’ll make some cleanup changes in travis, tox, etc in a future commit.

[pri22296]

In v0.6.0, there is a constraint that all strings must be unicode as mentioned here. This wasn’t in previous versions and will again be removed in v0.7.0

So in this case you can either replace

t.column_headers = ["a", "b", "c"]

with

t.column_headers = [u"a", u"b", u"c"]

or add

from __future__ import unicode_literals

at the top of the file as a temporary fix.

You could also downgrade to v0.5.3 if you do not need features added in v0.6.0