rubocop/conflicts: use full name in whitelist.

Library/Homebrew/rubocops/conflicts.rb

@@ -12,13 +12,13 @@ module RuboCop
               "Use `keg_only :versioned_formula` instead."
 
         WHITELIST = %w[
-          bash-completion@
+          bash-completion@2
         ].freeze
 
         def audit_formula(_node, _class_node, _parent_class_node, body)
           return unless versioned_formula?
 
-          problem MSG if !@formula_name.start_with?(*WHITELIST) &&
+          problem MSG if !WHITELIST.include?(@formula_name) &&
                          method_called_ever?(body, :conflicts_with)
         end
       end