Update Sinon.JS documentation (4.2.2)

Author: Thibaut

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -592,7 +592,7 @@ credits = [
     'https://raw.githubusercontent.com/scikit-learn/scikit-learn/master/COPYING'
   ], [
     'Sinon',
-    '2010-2017 Christian Johansen',
+    '2010-2018 Christian Johansen',
     'BSD',
     'https://raw.githubusercontent.com/sinonjs/sinon/master/LICENSE'
   ], [

lib/docs/scrapers/sinon.rb

@@ -14,12 +14,12 @@ class Sinon < UrlScraper
     options[:container] = '.content .container'
 
     options[:attribution] = <<-HTML
-      &copy; 2010&ndash;2017 Christian Johansen<br>
+      &copy; 2010&ndash;2018 Christian Johansen<br>
       Licensed under the BSD License.
     HTML
 
     version '4' do
-      self.release = '4.1.2'
+      self.release = '4.2.2'
       self.base_url = "http://sinonjs.org/releases/v#{release}/"
     end