Merge pull request #3235 from jekyll/drop-ruby-1-9

.travis.yml

@@ -4,7 +4,6 @@ sudo: false
 rvm:
 - 2.1
 - 2.0
-- 1.9.3
 env:
   matrix:
   - TEST_SUITE=test

jekyll.gemspec

@@ -7,7 +7,7 @@ Gem::Specification.new do |s|
   s.specification_version = 2 if s.respond_to? :specification_version=
   s.required_rubygems_version = Gem::Requirement.new('>= 0') if s.respond_to? :required_rubygems_version=
   s.rubygems_version = '2.2.2'
-  s.required_ruby_version = '>= 1.9.3'
+  s.required_ruby_version = '>= 2.0.0'
 
   s.name          = 'jekyll'
   s.version       = Jekyll::VERSION