Merge pull request cerebris#853 from campreb/patch-1

Update minimum required Ruby version.

Author: lgebhardt

jsonapi-resources.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
  spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.test_files = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ['lib']
- spec.required_ruby_version = '>= 2.0'
+ spec.required_ruby_version = '>= 2.1'
 
  spec.add_development_dependency 'bundler', '~> 1.5'
  spec.add_development_dependency 'rake'