Update attribution for PostgreSQL (2018 -> 2019)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -593,7 +593,7 @@ credits = [
     'https://raw.githubusercontent.com/ponylang/ponyc/master/LICENSE'
   ], [
     'PostgreSQL',
-    '1996-2018 The PostgreSQL Global Development Group<br>&copy; 1994 The Regents of the University of California',
+    '1996-2019 The PostgreSQL Global Development Group<br>&copy; 1994 The Regents of the University of California',
     'PostgreSQL',
     'https://www.postgresql.org/about/licence/'
   ], [

lib/docs/scrapers/postgresql.rb

@@ -51,7 +51,7 @@ module Docs
       /\Aunsupported-features/ ]
 
     options[:attribution] = <<-HTML
-      &copy; 1996&ndash;2018 The PostgreSQL Global Development Group<br>
+      &copy; 1996&ndash;2019 The PostgreSQL Global Development Group<br>
       Licensed under the PostgreSQL License.
     HTML