Update Matplotlib documentation (3.4.1)

Author: simon04

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -508,7 +508,7 @@ credits = [
     'https://daringfireball.net/projects/markdown/license'
   ], [
     'Matplotlib',
-    '2012-2020 Matplotlib Development Team. All rights reserved.',
+    '2012-2021 Matplotlib Development Team. All rights reserved.',
     'Custom',
     'https://raw.githubusercontent.com/matplotlib/matplotlib/master/LICENSE/LICENSE'
   ], [

lib/docs/scrapers/matplotlib.rb

@@ -16,10 +16,19 @@ class Matplotlib < UrlScraper
     options[:skip] = %w(api_changes.html tutorial.html faq.html)
 
     options[:attribution] = <<-HTML
-      &copy; 2012&ndash;2020 Matplotlib Development Team. All rights reserved.<br>
+      &copy; 2012&ndash;2021 Matplotlib Development Team. All rights reserved.<br>
       Licensed under the Matplotlib License Agreement.
     HTML
 
+    version '3.4' do
+      self.release = '3.4.1'
+      self.base_urls = [
+        "https://matplotlib.org/#{release}/api/",
+        "https://matplotlib.org/#{release}/mpl_toolkits/mplot3d/",
+        "https://matplotlib.org/#{release}/mpl_toolkits/axes_grid/api/"
+      ]
+    end
+
     version '3.3' do
       self.release = '3.3.3'
       self.base_urls = [