language: ruby
rvm:
  - 2.2.5
  - 2.3.1
services:
  - redis-server
sudo: false
cache: bundler
addons:
  apt:
    packages:
    - libpcap-dev

language: ruby
rvm:
  - 2.1.10
  - 2.2.6
  - 2.3.3
  - 2.4.0
services:
  - redis-server
sudo: false
cache: bundler
addons:
  apt:
    packages:
    - libpcap-dev
before_install:
  - gem update --system

Set Travis to all current Ruby versions, and workaround a currently known issue.
Set Travis to all current Ruby versions, and workaround a currently known issue.
