Update npm documentation (5.5.1)

lib/docs/filters/npm/clean_html.rb

@@ -9,7 +9,7 @@ module Docs
           css('meta', '.colophon').remove
         end
 
-        css('a.deep-link[id]').each do |node|
+        css('a.deep-link[id]', 'a.anchor[id]').each do |node|
           node.parent['id'] = node['id']
           node.remove
         end

lib/docs/filters/npm/entries.rb

@@ -28,11 +28,11 @@ module Docs
         when 'files/package.json'
           css('#page > h2').each_with_object [] do |node, entries|
             next if node.content =~ /\A[A-Z]/
-            entries << ["package.json: #{node.content}", node.at_css('.deep-link')['id']]
+            entries << ["package.json: #{node.content}", node.at_css('.anchor')['id']]
           end
         when 'misc/config'
           css('h2:contains("Config Settings") ~ h3').map do |node|
-            ["config: #{node.content}", node.at_css('.deep-link')['id']]
+            ["config: #{node.content}", node.at_css('.anchor')['id']]
           end
         else
           []

lib/docs/scrapers/npm.rb

@@ -2,7 +2,7 @@ module Docs
   class Npm < UrlScraper
     self.name = 'npm'
     self.type = 'npm'
-    self.release = '5.4.1'
+    self.release = '5.5.1'
     self.base_url = 'https://docs.npmjs.com/'
     self.force_gzip = true
     self.links = {