Add python 3.7 in travis and tox

Author: aruhier

.travis.yml

@@ -2,14 +2,16 @@ language: python
 
 matrix:
   include:
-    - python: 3.6-dev
+    - python: 3.7-dev
       env: TOXENV=coveralls
     - python: 3.4
       env: TOXENV=py34
     - python: 3.5-dev
       env: TOXENV=py35
     - python: 3.6-dev
       env: TOXENV=py36
+    - python: 3.7-dev
+      env: TOXENV=py37
 
 sudo: required
 dist: trusty

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34, py35, py36
+envlist = py34, py35, py36, py37
 
 [testenv]
 deps =
@@ -13,7 +13,7 @@ commands= python setup.py test
 [testenv:coveralls]
 passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH COVERALLS_REPO_TOKEN
 usedevelop=True
-basepython=python3.6
+basepython=python3.7
 changedir=.
 deps =
     {[testenv]deps}