Rework gemspec (#47)

* Rework gemspec

Author: Thomas Hareau

safe-pg-migrations.gemspec

@@ -10,10 +10,17 @@ Gem::Specification.new do |s|
 
   s.version = SafePgMigrations::VERSION
 
-  s.authors  = ['Matthieu Prat', 'Romain Choquet']
-  s.email    = '[email protected]'
+  s.authors  = ['Matthieu Prat', 'Romain Choquet', 'Thomas Hareau']
   s.homepage = 'https://github.com/doctolib/safe-pg-migrations'
 
+  s.metadata = {
+    'bug_tracker_uri' => 'https://github.com/doctolib/safe-pg-migrations/issues',
+    'homepage_uri' => 'https://github.com/doctolib/safe-pg-migrations#safe-pg-migrations',
+    'mailing_list_uri' => 'https://doctolib.engineering/engineering-news-ruby-rails-react',
+    'source_code_uri' => 'https://github.com/doctolib/safe-pg-migrations',
+    'contributors_uri' => 'https://github.com/doctolib/safe-pg-migrations/graphs/contributors',
+  }
+
   s.files        = Dir['LICENSE', 'README.md', 'lib/**/*']
   s.require_path = 'lib'