Python 3.5 - 3.7 for linux and osx

Author: SabineHaas

.travis.yml

@@ -1,16 +1,30 @@
 language: python
 
-os:
-  - linux
-  - osx
-
 matrix:
   include:
-    - python: 3.5
-    - python: 3.6
-    - python: 3.7
+    - os: linux
+      sudo: true
+      python: "3.5"
+      dist: xenial
+
+    - os: linux
+      sudo: true
+      python: "3.6"
       dist: xenial
+
+     - os: linux
       sudo: true
+      python: "3.7"
+      dist: xenial
+
+    - os: osx
+      python: "3.5"
+
+    - os: osx
+      python: "3.6"
+
+    - os: osx
+      python: "3.7"
 
 # command to install dependencies
 #before_install: