update metadata

* This project doens't use YARD
* The official API docs are not on rubydoc.info

gli.gemspec

@@ -13,12 +13,12 @@ spec = Gem::Specification.new do |s|
   s.description = "Build command-suite CLI apps that are awesome.  Bootstrap your app, add commands, options and documentation while maintaining a well-tested idiomatic command-line app"
 
   s.metadata = {
-    'yard.run'          => 'yard',
     'bug_tracker_uri'   => 'https://github.com/davetron5000/gli/issues',
     'changelog_uri'     => 'https://github.com/davetron5000/gli/releases',
-    'documentation_uri' => 'https://www.rubydoc.info/gems/gli/',
+    'documentation_uri' => 'http://davetron5000.github.io/gli/rdoc/index.html',
     'homepage_uri'      => 'https://davetron5000.github.com/gli/',
-    'source_code_uri'   => 'https://github.com/davetron5000/gli/'
+    'source_code_uri'   => 'https://github.com/davetron5000/gli/',
+    'wiki_url'          => 'https://github.com/davetron5000/gli/wiki',
   }
 
   s.files         = `git ls-files`.split("\n")