Compability with simple-navigation 4.0.0

I am not sure if it can work with simple-navigation prior 4.0.0 or not, so I simply forced the gemspec to work only with ver 4+.

lib/simple-navigation-bootstrap/version.rb

@@ -1,3 +1,3 @@
 module SimpleNavigationBootstrap
-  VERSION = "1.0.2"
+  VERSION = "1.0.3"
 end

lib/simple_navigation/rendering/renderer/bootstrap.rb

@@ -49,18 +49,17 @@ def tag_for(item, name = '', icon = nil, split = false, dropdown = false)
         link << content_tag(:i, '', :class => [icon].flatten.compact.join(' ')) unless icon.nil?
         link << name
         if include_sub_navigation?(item)
-          item_options = item.html_options
-          item_options[:link] = Hash.new if item_options[:link].nil?
-          item_options[:link][:class] = Array.new if item_options[:link][:class].nil?
+          item_link_html_opts = item.link_html_options || Hash.new
+          item_link_html_opts[:class] = Array.new if item_link_html_opts[:class].nil?
           unless split
             if dropdown
-              item_options[:link][:class] << 'dropdown-toggle'
-              item_options[:link][:'data-toggle'] = 'dropdown'
-              item_options[:link][:'data-target'] = '#'
+              item_link_html_opts[:class] << 'dropdown-toggle'
+              item_link_html_opts[:'data-toggle'] = 'dropdown'
+              item_link_html_opts[:'data-target'] = '#'
             end
             link << content_tag(:b, '', :class => 'caret')
           end
-          item.html_options = item_options
+          item.instance_variable_set(:'@link_html_options', item_link_html_opts)
         end
         link_to(link.join(" ").html_safe, url, options_for(item))
       end

simple-navigation-bootstrap.gemspec

@@ -18,6 +18,6 @@ Gem::Specification.new do |s|
 
   # specify any dependencies here; for example:
   s.add_development_dependency "rake"
-  s.add_runtime_dependency "simple-navigation", ">= 3.7.0", "< 4.0.0"
+  s.add_runtime_dependency "simple-navigation", ">= 4.0.0"
   s.add_runtime_dependency "railties", ">= 3.1"
 end