Fix error with Python3 on Ubuntu (fixes #12)
Fix error with Python3 on Ubuntu (fixes #12)

https://travis-ci.org/mrkn/pycall/builds/217972716

mrkn/pycall.rb,mrkn/pycall,mrkn/pycall,mrkn/pycall.rb,mrkn/pycall.rb,mrkn/pycall.rb,mrkn/pycall,mrkn/pycall