Update Sinon.JS documentation (5.1.0)

lib/docs/scrapers/sinon.rb

@@ -19,7 +19,7 @@ module Docs
     HTML
 
     version '5' do
-      self.release = '5.0.7'
+      self.release = '5.1.0'
       self.base_url = "http://sinonjs.org/releases/v#{release}/"
     end