Update Cordova documentation (6.4.0)

lib/docs/filters/cordova/clean_html.rb

@@ -13,7 +13,7 @@ module Docs
         end
 
         css('img[src*="travis-ci"]').each do |node|
-          node.ancestors('p').first.remove
+          node.ancestors('p, a').first.remove
         end
 
         css('pre').each do |node|

lib/docs/scrapers/cordova.rb

@@ -28,7 +28,7 @@ module Docs
     HTML
 
     version '6' do
-      self.release = '6.3.1'
+      self.release = '6.4.0'
       self.base_url = 'https://cordova.apache.org/docs/en/6.x/'
     end
   end