[rubygems/rubygems] Use https instead of http

https://github.com/rubygems/rubygems/commit/bcbe6f7b7a

lib/bundler/man/bundle-install.1.ronn

@@ -379,5 +379,5 @@ does not work, run [bundle update(1)](bundle-update.1.html).
 
 ## SEE ALSO
 
-* [Gem install docs](http://guides.rubygems.org/rubygems-basics/#installing-gems)
-* [Rubygems signing docs](http://guides.rubygems.org/security/)
+* [Gem install docs](https://guides.rubygems.org/rubygems-basics/#installing-gems)
+* [Rubygems signing docs](https://guides.rubygems.org/security/)

lib/bundler/man/gemfile.5.ronn

@@ -96,7 +96,7 @@ What exactly is an Engine?
 
   - [Other implementations](https://www.ruby-lang.org/en/about/) of Ruby exist.
     Some of the more well-known implementations include
-    [JRuby](http://jruby.org/) and [TruffleRuby](https://www.graalvm.org/ruby/).
+    [JRuby](https://www.jruby.org/) and [TruffleRuby](https://www.graalvm.org/ruby/).
     Rubinius is an alternative implementation of Ruby written in Ruby.
     JRuby is an implementation of Ruby on the JVM, short for Java Virtual Machine.
     TruffleRuby is a Ruby implementation on the GraalVM, a language toolkit built on the JVM.
@@ -509,7 +509,7 @@ software is installed or some other conditions are met.
 
 ## GEMSPEC
 
-The [`.gemspec`](http://guides.rubygems.org/specification-reference/) file is where
+The [`.gemspec`](https://guides.rubygems.org/specification-reference/) file is where
  you provide metadata about your gem to Rubygems. Some required Gemspec
  attributes include the name, description, and homepage of your gem. This is
  also where you specify the dependencies your gem needs to run.

lib/rubygems/commands/help_command.rb

@@ -59,7 +59,7 @@ multiple environments.  The RubyGems implementation is designed to be
 compatible with Bundler's Gemfile format.  You can see additional
 documentation on the format at:
 
-  http://bundler.io
+  https://bundler.io
 
 RubyGems automatically looks for these gem dependencies files:
 
@@ -172,7 +172,7 @@ and #platforms methods:
 See the bundler Gemfile manual page for a list of platforms supported in a gem
 dependencies file.:
 
-  http://bundler.io/v1.6/man/gemfile.5.html
+  https://bundler.io/v2.5/man/gemfile.5.html
 
 Ruby Version and Engine Dependency
 ==================================

lib/rubygems/security.rb

@@ -323,7 +323,7 @@ require_relative "openssl"
 # == Original author
 #
 # Paul Duncan <pabs@pablotron.org>
-# http://pablotron.org/
+# https://pablotron.org/
 
 module Gem::Security
   ##

lib/rubygems/specification.rb

@@ -341,7 +341,7 @@ class Gem::Specification < Gem::BasicSpecification
   # https://opensource.org/licenses/ approved.
   #
   # The most commonly used OSI-approved licenses are MIT and Apache-2.0.
-  # GitHub also provides a license picker at http://choosealicense.com/.
+  # GitHub also provides a license picker at https://choosealicense.com/.
   #
   # You can also use a custom license file along with your gemspec and specify
   # a LicenseRef-<idstring>, where idstring is the name of the file containing