rubocop: allow all current core formula names.

Library/.rubocop_rules.yml

@@ -116,7 +116,7 @@ Style/FileName:
   #   FILENAME.rb (ARGV and ENV)
   # does not match:
   #   dashes-and_underscores.rb
-  Regex: !ruby/regexp /^((([\dA-Z]+|[\da-z]+)(_([\dA-Z]+|[\da-z]+))*|(\-\-)?([\dA-Z]+|[\da-z]+)(-([\dA-Z]+|[\da-z]+))*))(\.rb)?$/
+  Regex: !ruby/regexp /^((([\dA-Z]+|[\da-z\+]+)(_([\dA-Z]+|[\da-z\+]+))*|(\-\-)?([\dA-Z]+|[\da-z\+\.]+)([-@]([\dA-Z]+|[\da-z\+\.]+))*))(\.rb)?$/
 
 # no percent word array, being friendly to non-ruby users
 # TODO: enforce when rubocop has fixed this