* lib/rubygems: Update to RubyGems 2.4.1 master(713ab65)

Complete history at:
  https://github.com/rubygems/rubygems/blob/master/History.txt#L3-L216
* test/rubygems:  ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/command.rb

@@ -148,6 +148,8 @@ class Gem::Command
 
   ##
   # Display to the user that a gem couldn't be found and reasons why
+  #--
+  # TODO: replace +domain+ with a parameter to suppress suggestions
 
   def show_lookup_failure(gem_name, version, errors, domain)
     if errors and !errors.empty?
@@ -557,7 +559,8 @@ basic help message containing pointers to more information.
   Further help:
     gem help commands            list all 'gem' commands
     gem help examples            show some examples of usage
-    gem help platforms           show information about platforms
+    gem help gem_dependencies    gem dependencies file guide
+    gem help platforms           gem platforms guide
     gem help <COMMAND>           show help on COMMAND
                                    (e.g. 'gem help install')
     gem server                   present a web page at