Force at least nokogiri 1.8.2 when possible

Author: pitbulk

ruby-saml.gemspec

@@ -30,18 +30,18 @@ Gem::Specification.new do |s|
   # have liked to constrain Ruby 1.8.7 to install only the 1.5.x versions.
   if defined?(JRUBY_VERSION)
     if JRUBY_VERSION < '9.2.0.0'
-      s.add_runtime_dependency('nokogiri', '>= 1.6.0', '<= 1.8.5')
+      s.add_runtime_dependency('nokogiri', '>= 1.8.2', '<= 1.8.5')
       s.add_runtime_dependency('jruby-openssl', '>= 0.9.8')
     else
-      s.add_runtime_dependency('nokogiri', '>= 1.6.0')
+      s.add_runtime_dependency('nokogiri', '>= 1.8.2')
     end
   elsif RUBY_VERSION < '1.9'
     s.add_runtime_dependency('uuid')
     s.add_runtime_dependency('nokogiri', '<= 1.5.11')
   elsif RUBY_VERSION < '2.1'
     s.add_runtime_dependency('nokogiri', '>= 1.5.10', '<= 1.6.8.1')
   else
-    s.add_runtime_dependency('nokogiri', '>= 1.5.10')
+    s.add_runtime_dependency('nokogiri', '>= 1.8.2')
   end
 
   s.add_development_dependency('minitest', '~> 5.5')