.travis.yml in pycall-0.1.0.alpha.20170226 vs .travis.yml in pycall-0.1.0.alpha.20170302

- old
+ new

@@ -1,12 +1,17 @@
 sudo: false
 language: ruby
 
 rvm:
-  - 2.1.10
-  - 2.2.5
-  - 2.3.1
   - ruby-head
+  - 2.4.0
+  - 2.3.1
+  - 2.2.5
+  - 2.1.10
+
+env:
+  - PYTHON=python
+  - PYTHON=python3
 
 addons:
   apt:
     packages:
       - python3