Update Redis documentation (4.0.9)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -557,7 +557,7 @@ credits = [
     'https://raw.githubusercontent.com/reactjs/reactjs.org/master/LICENSE-DOCS.md'
   ], [
     'Redis',
-    '2009-2017 Salvatore Sanfilippo',
+    '2009-2018 Salvatore Sanfilippo',
     'CC BY-SA',
     'https://creativecommons.org/licenses/by-sa/4.0/'
   ], [

lib/docs/scrapers/redis.rb

@@ -1,7 +1,7 @@
 module Docs
   class Redis < UrlScraper
     self.type = 'redis'
-    self.release = '4.0.6'
+    self.release = '4.0.9'
     self.base_url = 'https://redis.io/commands'
     self.links = {
       home: 'https://redis.io/',
@@ -16,7 +16,7 @@ module Docs
     options[:follow_links] = ->(filter) { filter.root_page? }
 
     options[:attribution] = <<-HTML
-      &copy; 2009&ndash;2017 Salvatore Sanfilippo<br>
+      &copy; 2009&ndash;2018 Salvatore Sanfilippo<br>
       Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
     HTML
   end