rvm:
  - 2.1.0
  - 2.1.1
  - 2.2.1
  - 2.3.0
  - 2.4.0
  - jruby-9.1.8.0
jdk:
  - oraclejdk8
before_install:
 - sudo apt-get update
 - sudo apt-get install libicu-dev

rvm:
  - 2.3.0
  - 2.4.0
  - jruby-9.1.8.0
jdk:
  - oraclejdk8
before_install:
 - sudo apt-get update
 - sudo apt-get install libicu-dev

Drop support for ruby =< 2.2 on Travis (due to Sinatra upgrade to 2.0).
Drop support for ruby =< 2.2 on Travis (due to Sinatra upgrade to 2.0).
