Handle some files under the doc directory for gemspec

Author: hsbt

Manifest.txt

@@ -4,11 +4,6 @@ LICENSE.txt
 MIT.txt
 Manifest.txt
 README.md
-doc/MAINTAINERS.txt
-doc/rubygems/CONTRIBUTING.md
-doc/rubygems/POLICIES.md
-doc/rubygems/UPGRADING.md
-doc/bundler/UPGRADING.md
 bundler/CHANGELOG.md
 bundler/LICENSE.md
 bundler/README.md
@@ -357,6 +352,11 @@ bundler/lib/bundler/version.rb
 bundler/lib/bundler/vlad.rb
 bundler/lib/bundler/worker.rb
 bundler/lib/bundler/yaml_serializer.rb
+doc/MAINTAINERS.txt
+doc/bundler/UPGRADING.md
+doc/rubygems/CONTRIBUTING.md
+doc/rubygems/POLICIES.md
+doc/rubygems/UPGRADING.md
 exe/gem
 exe/update_rubygems
 hide_lib_for_update/note.txt

Rakefile

@@ -450,7 +450,7 @@ module Rubygems
   class ProjectFiles
     def self.all
       files = []
-      exclude = %r{\A(?:\.|bundler/(?!lib|exe|[^/]+\.md|bundler.gemspec)|tool/|Rakefile|bin|test)}
+      exclude = %r{\A(?:\.|bundler/(?!lib|exe|[^/]+\.md|bundler.gemspec)|tool/|Rakefile|bin|test|doc)}
       tracked_files = `git ls-files`.split("\n")
 
       tracked_files.each do |path|
@@ -459,6 +459,15 @@ module Rubygems
         files << path
       end
 
+      # Restore important documents
+      %w[
+        doc/MAINTAINERS.txt
+        doc/bundler/UPGRADING.md
+        doc/rubygems/CONTRIBUTING.md
+        doc/rubygems/POLICIES.md
+        doc/rubygems/UPGRADING.md
+      ].each {|f| files << f }
+
       files.sort
     end
   end