Update TensorFlow documentation (2.4.0)

Author: simon04

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -798,9 +798,9 @@ credits = [
     'http://tcl.tk/software/tcltk/license.html'
   ], [
     'TensorFlow',
-    '2019 The TensorFlow Authors',
+    '2020 The TensorFlow Authors',
     'CC BY',
-    'https://creativecommons.org/licenses/by/3.0/'
+    'https://creativecommons.org/licenses/by/4.0/'
   ], [
     'Terraform',
     '2018 HashiCorp',

lib/docs/scrapers/tensorflow/tensorflow.rb

@@ -15,10 +15,15 @@ class Tensorflow < UrlScraper
 
     options[:attribution] = <<-HTML
       &copy; 2020 The TensorFlow Authors. All rights reserved.<br>
-      Licensed under the Creative Commons Attribution License 3.0.<br>
+      Licensed under the Creative Commons Attribution License 4.0.<br>
       Code samples licensed under the Apache 2.0 License.
     HTML
 
+    version '2.4' do
+      self.release = "#{version}.0"
+      self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/python/tf"
+    end
+
     version '2.3' do
       self.release = "#{version}.0"
       self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/python/tf"

lib/docs/scrapers/tensorflow/tensorflow_cpp.rb

@@ -3,6 +3,11 @@ class TensorflowCpp < Tensorflow
     self.name = 'TensorFlow C++'
     self.slug = 'tensorflow_cpp'
 
+    version '2.4' do
+      self.release = "#{version}.0"
+      self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/cc"
+    end
+
     version '2.3' do
       self.release = "#{version}.0"
       self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/cc"