Update .rubocop_todo.yml.

Library/.rubocop_todo.yml

 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 100`
-# on 2016-09-20 22:03:20 +0200 using RuboCop version 0.43.0.
+# on 2016-09-20 22:27:29 +0200 using RuboCop version 0.43.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -148,7 +148,7 @@ Style/ConstantName:
   Exclude:
     - 'Homebrew/os/mac.rb'
 
-# Offense count: 10
+# Offense count: 3
 Style/DoubleNegation:
   Exclude:
     - 'Homebrew/os/mac/cctools_keg.rb'