Merge pull request #522 from samvera/ruby-2.5

Require ruby 2.5 or greater

Author: cjcolvar

hydra-head.gemspec

@@ -14,11 +14,11 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.license       = 'APACHE-2.0'
 
-  s.required_ruby_version = '>= 2.4'
+  s.required_ruby_version = '>= 2.5'
 
   s.add_dependency 'hydra-access-controls', version
   s.add_dependency 'hydra-core', version
-  s.add_dependency 'rails', '>= 5.2', '< 6.1'
+  s.add_dependency 'rails', '>= 5.2', '< 7'
 
   s.add_development_dependency 'coveralls'
   s.add_development_dependency 'engine_cart', '~> 2.2'