Depend on version.rb to ensure we rebuild with new releases.

chef/Rakefile

@@ -74,7 +74,7 @@ namespace :docs do
     Dir['distro/common/man/man1/*.1'].each do |man|
       topics << File.basename(man, '.1')
     end
-    
+
     File.open('lib/chef/knife/help_topics.rb', 'w') do |f|
       f.puts "# Do not edit this file by hand"
       f.puts "# This file is autogenerated by the docs:list rake task from the available manpages\n\n"
@@ -95,12 +95,12 @@ namespace :docs do
           htmlfile = "distro/common/html/#{basename}.8.html"
         end
 
-        file(manfile => mkd) do
+        file(manfile => [mkd, 'lib/chef/version.rb']) do
            sh "ronn -r #{RONN_OPTS} #{mkd} --pipe > #{manfile}"
          end
          task :man => manfile
 
-         file(htmlfile => mkd) do
+         file(htmlfile => [mkd, 'lib/chef/version.rb']) do
            sh "ronn -5 #{RONN_OPTS} --style=toc #{mkd} --pipe > #{htmlfile}"
          end
          task :html => htmlfile