RUBY-1958 RUBY-1659 Add gem metadata to Ruby driver (#1555)

* RUBY-1958 Add repository URL to gemspec

* RUBY-1659 add remaining gem metadata

Author: p-mongo

mongo.gemspec

@@ -9,11 +9,20 @@ Gem::Specification.new do |s|
 
   s.authors           = ['Tyler Brock', 'Emily Stolfo', 'Durran Jordan']
   s.email             = 'mongodb-dev@googlegroups.com'
-  s.homepage          = 'http://www.mongodb.org'
+  s.homepage          = 'https://docs.mongodb.com/ruby-driver/'
   s.summary           = 'Ruby driver for MongoDB'
   s.description       = 'A Ruby driver for MongoDB'
   s.license           = 'Apache-2.0'
 
+  s.metadata = {
+    'bug_tracker_uri' => 'https://jira.mongodb.org/projects/RUBY',
+    'changelog_uri' => 'https://github.com/mongodb/mongo-ruby-driver/releases',
+    'documentation_uri' => 'https://docs.mongodb.com/ruby-driver/',
+    'homepage_uri' => 'https://docs.mongodb.com/ruby-driver/',
+    'mailing_list_uri' => 'https://groups.google.com/group/mongodb-user',
+    'source_code_uri' => 'https://github.com/mongodb/mongo-ruby-driver',
+  }
+
   if File.exists?('gem-private_key.pem')
     s.signing_key     = 'gem-private_key.pem'
     s.cert_chain      = ['gem-public_cert.pem']