Update to Python 3.7

[alxwrd]

Python 3.7 was released yesterday/today 🎉 🎉

This adds 3.7 to the Travis file and the setup file.

Tests are running fine, except we are now getting FutureWarning's from pycodestyle as part of PEP 565 (Improved DeprecationWarning handling).

I am curious to see if the Travis build for 3.7 fails, as nightly was previously failing to build.

[alxwrd]

Unable to download 3.7 archive. The archive may not exist. Please consider a different version.

I guess we wait for Travis to add 3.7 to their s3 bucket.

[alxwrd]

See also travis-ci#9069

[jmsv]

:watch: :eyes: :snake:

[codecov-io]

Codecov Report

Merging #48 into master will increase coverage by 0.24%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   92.11%   92.35%   +0.24%     
==========================================
  Files           7        7              
  Lines         279      301      +22     
==========================================
+ Hits          257      278      +21     
- Misses         22       23       +1

Impacted Files	Coverage Δ
ety/word.py	84.31% <0%> (-0.8%)	:arrow_down:
tests.py	99.19% <0%> (+0.11%)	:arrow_up:
ety/language.py	73.33% <0%> (+4.1%)	:arrow_up:

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[alxwrd]

So a build for Ubuntu Xenial (16.04) allows building with Python 3.7, but doesn't support Python 3.4. 🤔

Do we remove 3.4 support, or add conditionals to the .travis.yml file?

[jmsv]

@alxwrd Thanks for looking into this!

I'm hesitant to remove 3.4 support in trying to keep as much compatibility as possible

Looking at the requests Travis config, they use the following versions:

- "2.7"
- "3.4"
- "3.5"
- "3.6"
- "3.7-dev"

Could we use 3.7-dev until 3.7 is fully supported?

Also, do we need sudo: true? I think it's probably best to disable sudo if we can

[alxwrd]

I think 3.7-dev is a bit out of date. I'll make some commits to see if I can get anything to work well.