Fixed a lot of linter warnings

src/server.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'sinatra/base'
 require 'sequel'
 require 'sqlite3'
@@ -9,6 +11,7 @@ DB = Sequel.connect(adapter: $conf.get('database.adapter'), database: $conf.get(
 
 # Base app
 class GameData < Sinatra::Base
+
   enable :sessions
 
   # Set up static file serving
@@ -21,6 +24,7 @@ class GameData < Sinatra::Base
 
   # Set up our view engine
   set :views, File.join(settings.root, '/../views')
+
 end
 
 # Load routes