Update Express documentation (4.15.4)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -240,7 +240,7 @@ credits = [
     'https://raw.githubusercontent.com/erlang/otp/maint/LICENSE.txt'
   ], [
     'Express',
-    '2016 StrongLoop, IBM, and other expressjs.com contributors.',
+    '2017 StrongLoop, IBM, and other expressjs.com contributors.',
     'CC BY-SA',
     'https://raw.githubusercontent.com/expressjs/expressjs.com/gh-pages/LICENSE.md'
   ], [

lib/docs/scrapers/express.rb

@@ -2,7 +2,7 @@ module Docs
   class Express < UrlScraper
     self.name = 'Express'
     self.type = 'express'
-    self.release = '4.15.2'
+    self.release = '4.15.4'
     self.base_url = 'http://expressjs.com/en/'
     self.root_path = '4x/api.html'
     self.initial_paths = %w(
@@ -25,7 +25,7 @@ module Docs
       /\Aadvanced/ ]
 
     options[:attribution] = <<-HTML
-      &copy; 2016 StrongLoop, IBM, and other expressjs.com contributors.<br>
+      &copy; 2017 StrongLoop, IBM, and other expressjs.com contributors.<br>
       Licensed under the Creative Commons Attribution-ShareAlike License v3.0.
     HTML
   end