Drop python 2.6 support and add python 3.7 testing
About 2.6:
python 2.6 has been unsupported for at least 4 years. Drop support for
the python version as there have been several changes made in recent
years to fix functional and security bugs with the interpreter, etc.
It's best to upgrade to python 2.7 (if one is stuck on 2.x), or upgrade
to py3.
About 3.7:
python 3.7.0 was released 10 months ago. As such, it's reasonable to add
test coverage to ensure it functions.
It is reasonably close feature-wise to 3.6 that there will unlikely be
any behavioral difference in this package. Some of the benefits of 3.7
over earlier versions is improved `asyncio` module support and general
performance improvements.
More information about what's new in 3.7 can be found
[here](https://docs.python.org/3.7/whatsnew/3.7.html).
* Switch from Trusty (the default Ubuntu distro) to Xenial in order to
support python 3.7 testing with Travis, as Trusty lacks python 3.7
support.
* Use pypy3.5 since the pypy package (unversioned) isn't available for
Xenial, per the
[Travis CI docs](https://docs.travis-ci.com/user/languages/python/#pypy-support).
Signed-off-by: Enji Cooper <yaneurabeya@gmail.com>
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