Missed {} in a few places

Author: chrisbutcher

lib/graphql/query/arguments.rb

@@ -95,7 +95,7 @@ def each_value
         end
       end
 
-      NO_ARGS = self.new({}, argument_definitions: [], defaults_used: {})
+      NO_ARGS = self.new({}, argument_definitions: [], defaults_used: Set.new)
 
       class << self
         attr_accessor :argument_definitions

spec/graphql/query/arguments_spec.rb

@@ -328,7 +328,7 @@
       assert_equal nil, input_object.arguments_class
 
       GraphQL::Query::Arguments.construct_arguments_class(input_object)
-      args = input_object.arguments_class.new({foo: 3, bar: -90}, {})
+      args = input_object.arguments_class.new({foo: 3, bar: -90}, Set.new)
 
       assert_equal 3, args.foo
       assert_equal -90, args.bar