Merge pull request #4103 from FunkyloverOne/relay_nodes_field-reader

`Schema::Field`: add `#relay_nodes_field` attr reader

Author: rmosolgo

lib/graphql/schema/field.rb

@@ -181,6 +181,8 @@ def self.connection_extension(new_extension_class = nil)
 
       # @return Boolean
       attr_reader :relay_node_field
+      # @return Boolean
+      attr_reader :relay_nodes_field
 
       # @return [Boolean] Should we warn if this field's name conflicts with a built-in method?
       def method_conflict_warning?