Update metadata (#121)

See https://guides.rubygems.org/specification-reference/#metadata

Signed-off-by: Kentaro Hayashi <hayashi@clear-code.com>

Author: kenhys

fluent-plugin-systemd.gemspec

@@ -12,12 +12,16 @@ Gem::Specification.new do |spec|
 
   spec.summary       = 'Input plugin to read from systemd journal.'
   spec.description   = 'This is a fluentd input plugin. It reads logs from the systemd journal.'
-  spec.homepage      = 'https://github.com/reevoo/fluent-plugin-systemd'
+  spec.homepage      = 'https://github.com/fluent-plugins-nursery/fluent-plugin-systemd'
   spec.license       = 'Apache-2.0'
 
   spec.files         = Dir['lib/**/**.rb', 'README.md', 'LICENCE']
   spec.require_paths = ['lib']
 
+  spec.metadata['homepage_uri'] = spec.homepage
+  spec.metadata['source_code_uri'] = 'https://github.com/fluent-plugins-nursery/fluent-plugin-systemd'
+  spec.metadata['bug_tracker_uri'] = 'https://github.com/fluent-plugins-nursery/fluent-plugin-systemd/issues'
+
   spec.add_development_dependency 'bundler', '> 1.10'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'test-unit', '~> 3.4'