Update nginx documentation (1.13.9)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -447,7 +447,7 @@ credits = [
     'https://github.com/LearnBoost/mongoose/blob/master/README.md#license'
   ], [
     'nginx',
-    '2002-2017 Igor Sysoev<br>&copy; 2011-2017 Nginx, Inc.',
+    '2002-2018 Igor Sysoev<br>&copy; 2011-2018 Nginx, Inc.',
     'BSD',
     'http://nginx.org/LICENSE'
   ], [

lib/docs/scrapers/nginx.rb

@@ -2,7 +2,7 @@ module Docs
   class Nginx < UrlScraper
     self.name = 'nginx'
     self.type = 'nginx'
-    self.release = '1.13.8'
+    self.release = '1.13.9'
     self.base_url = 'https://nginx.org/en/docs/'
     self.links = {
       home: 'https://nginx.org/',
@@ -21,8 +21,8 @@ module Docs
     options[:skip_patterns] = [/\/faq\//]
 
     options[:attribution] = <<-HTML
-      &copy; 2002-2017 Igor Sysoev<br>
-      &copy; 2011-2017 Nginx, Inc.<br>
+      &copy; 2002-2018 Igor Sysoev<br>
+      &copy; 2011-2018 Nginx, Inc.<br>
       Licensed under the BSD License.
     HTML
   end