Run tests against Python 3.7, rather than nightly

Author: stasm

.travis.yml

@@ -1,10 +1,19 @@
 sudo: false
 language: python
-python:
-  - "2.7"
-  - "3.5"
-  - "3.6"
-  - "nightly"
+matrix:
+  include:
+    - python: 2.7
+      dist: trusty
+      sudo: false
+    - python: 3.5
+      dist: trusty
+      sudo: false
+    - python: 3.6
+      dist: trusty
+      sudo: false
+    - python: 3.7
+      dist: xenial
+      sudo: true
 install: pip install tox-travis
 script: tox
 notifications:

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py35, py36
+envlist = py27, py35, py36, py37
 skipsdist=True
 
 [testenv]