Update travis matrix

.travis-osx-install

@@ -0,0 +1,9 @@
+#!/bin/sh
+curl -Lo macpython.pkg https://www.python.org/ftp/python/${MACPYTHON}/python-${MACPYTHON}-macosx10.6.pkg
+sudo installer -pkg macpython.pkg -target /
+ls /Library/Frameworks/Python.framework/Versions/*/bin/
+PYTHON_EXE=/Library/Frameworks/Python.framework/Versions/*/bin/python3
+sudo $PYTHON_EXE -m pip install -U pip setuptools
+sudo $PYTHON_EXE -m pip install virtualenv
+$PYTHON_EXE -m virtualenv testenv
+source testenv/bin/activate

.travis.yml

@@ -1,16 +1,42 @@
+os: linux
+dist: xenial
 language: python
 
+python:
+- 3.5
+- pypy3.5
+- 3.6
+- 3.7
+- 3.8-dev
+
 matrix:
-    include:
-      - python: 3.4
-      - python: 3.5
-      - python: 3.6
-      - python: 3.7
-        dist: xenial
-        sudo: true
-      - python: 3.8-dev
-        dist: xenial
-        sudo: true
+  include:
+    # Linux - 3.4
+    - os: linux
+      dist: trusty
+      language: python
+      python: 3.4
+    # OSX - 3.4
+    - os: osx
+      language: generic
+      env: MACPYTHON=3.4.4
+      before_install: source .travis-osx-install
+    # OSX - 3.5
+    - os: osx
+      language: generic
+      env: MACPYTHON=3.5.4
+      before_install: source .travis-osx-install
+    # OSX - 3.6
+    - os: osx
+      language: generic
+      env: MACPYTHON=3.6.8
+      before_install: source .travis-osx-install
+    # OSX - 3.7
+    - os: osx
+      language: generic
+      env: MACPYTHON=3.7.2
+      before_install: source .travis-osx-install
+
 
 install: pip install -U coveralls pytest
 script: python setup.py test