Update PostgreSQL documentation (15.0)

Author: simon04

lib/docs/filters/postgresql/clean_html.rb

@@ -13,7 +13,7 @@ def root
       def other
         @doc = at_css('#docContent')
 
-        css('.navheader', 'hr', '.navfooter a[accesskey="H"]').remove
+        css('.navheader', 'hr', '.navfooter a[accesskey="H"]', '.navfooter').remove
 
         unless at_css('h1')
           at_css('.refnamediv h2, .titlepage h2').name = 'h1'

lib/docs/scrapers/postgresql.rb

@@ -55,6 +55,11 @@ class Postgresql < UrlScraper
       Licensed under the PostgreSQL License.
     HTML
 
+    version '15' do
+      self.release = '15.0'
+      self.base_url = "https://www.postgresql.org/docs/#{version}/"
+    end
+
     version '14' do
       self.release = '14.5'
       self.base_url = "https://www.postgresql.org/docs/#{version}/"