Use https link for homepage.

README.rdoc

@@ -6,7 +6,7 @@ Build status: {<img src="https://travis-ci.org/rest-client/rest-client.png" />}[
 A simple HTTP and REST client for Ruby, inspired by the Sinatra's microframework style
 of specifying actions: get, put, post, delete.
 
-* Main page: http://github.com/rest-client/rest-client
+* Main page: https://github.com/rest-client/rest-client
 * Mailing list: [email protected] (send a mail to subscribe).
 
 == Requirements

rest-client.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = ['README.rdoc', 'history.md']
   s.files = `git ls-files -z`.split("\0")
   s.test_files = `git ls-files -z spec/`.split("\0")
-  s.homepage = 'http://github.com/rest-client/rest-client'
+  s.homepage = 'https://github.com/rest-client/rest-client'
   s.summary = 'Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.'
 
   s.add_dependency('mime-types', '~> 2.0')