Update Socket.IO documentation (4.0.0)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -773,7 +773,7 @@ credits = [
     'https://raw.githubusercontent.com/sequelize/sequelize/master/LICENSE'
   ], [
     'Socket.io',
-    '2014-2015 Automattic',
+    '2014-2018 Automattic',
     'MIT',
     'https://raw.githubusercontent.com/Automattic/socket.io/master/LICENSE'
   ], [

lib/docs/filters/socketio/clean_html.rb

@@ -9,12 +9,16 @@ module Docs
         end
 
         # version documentation message
-        at_css('.warning').remove
+        css('.warning').remove
 
         css('header', 'footer', 'aside').remove
 
         css('pre').each do |node|
+          if node.at_css('.line').nil?
             node.content = node.content
+          else
+            node.content = node.css('.line').map(&:content).join("\n")
+          end
           node['data-language'] = node.content =~ /\A\s*</ ? 'html' : 'javascript'
         end
 

lib/docs/filters/socketio/entries.rb

@@ -6,7 +6,7 @@ module Docs
       end
 
       def get_type
-        if slug =~ /events|room|emit/ && version.eql?('3')
+        if slug =~ /events|room|emit/ && !version.eql?('2')
           'Events'
         else
           'Guides'

lib/docs/scrapers/socketio.rb

@@ -14,12 +14,17 @@ module Docs
     options[:skip] = %w(/faq /glossary)
 
     options[:attribution] = <<-HTML
-      &copy; 2014&ndash;2020 Automattic<br>
+      &copy; 2014&ndash;2021 Automattic<br>
       Licensed under the MIT License.
     HTML
 
+    version '4' do
+      self.release = '4.0.0'
+      self.base_url = "https://socket.io/docs/v#{version}"
+    end
+
     version '3' do
-      self.release = '3.0.5'
+      self.release = '3.1.2'
       self.base_url = "https://socket.io/docs/v#{version}"
     end