Try using python 3.4
Try using python 3.4

This should be good enough for our purposes, and it's in the trusty
repos by default. I believe 3.6 is not; IIRC some of my other projects
(e.g. [simp_le][1]) have had to do special things to get it in travis.

[1]: https://github.com/zenhack/simp_le

SahilTikale/haas,CCI-MOC/haas