ruby lint

- Apply new Hash style
- {} is prefered for block in case of single line

server.rb

@@ -16,7 +16,7 @@
 puts "Server started: http://localhost:#{port}/"
 
 root = File.expand_path './public'
-server = WEBrick::HTTPServer.new :Port => port, :DocumentRoot => root
+server = WEBrick::HTTPServer.new Port: port, DocumentRoot: root
 
 server.mount_proc '/comments.json' do |req, res|
   comments = JSON.parse(File.read('./comments.json'))
@@ -28,7 +28,7 @@
       comment[key] = value.force_encoding('UTF-8')
     end
     comments << comment
-    File.write('./comments.json', JSON.pretty_generate(comments, :indent => '    '))
+    File.write('./comments.json', JSON.pretty_generate(comments, indent: '    '))
   end
 
   # always return json
@@ -37,6 +37,6 @@
   res.body = JSON.generate(comments)
 end
 
-trap 'INT' do server.shutdown end
+trap('INT') { server.shutdown }
 
 server.start