Use Python 3.6

.travis.yml

@@ -4,6 +4,8 @@
 dist: trusty
 sudo: required
 language: python
+python:
+  - "3.6"
 env:
   - >
     DISTRIBUTION=ubuntu-upstart
@@ -60,7 +62,7 @@ env:
 services:
   - docker
 
-before_install:
+install:
   - bash tests/scripts/before_install.sh
 
 script:

tests/scripts/before_install.sh

@@ -2,7 +2,7 @@
 # -*- mode: sh; -*-
 
 # File: before_install.sh
-# Time-stamp: <2018-02-15 13:35:13>
+# Time-stamp: <2018-02-15 13:41:50>
 # Copyright (C) 2018 Sergei Antipov
 # Description:
 
@@ -17,7 +17,6 @@ sudo apt-get install apt-transport-https
 sudo apt-add-repository -y ppa:ansible/ansible
 sudo apt-get update
 sudo apt-get install ansible python-pip -y
-python --version
 ansible --version
 docker version
 sudo pip install docker-py