Fix tests for ruby 2.4#10

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voxik wants to merge 9 commits into

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voxik:fix-tests-for-ruby-2.4

Commits on Jun 23, 2014

Add support for Ruby 2.1.
voxik
committed

Commits on Jan 22, 2015

Add support for Ruby 2.2.
voxik
committed

Commits on Mar 21, 2016

Add support for Ruby 2.3.
junaruga
committed

Commits on Jan 17, 2017

Add support for Ruby 2.4.
voxik
committed