Merge pull request rmosolgo#2219 from swalkinshaw/fix-field-usage-method-args

Fix FieldUsage analyzer method args

Author: Robert Mosolgo

lib/graphql/analysis/ast/field_usage.rb

@@ -9,7 +9,7 @@ def initialize(query)
           @used_deprecated_fields = Set.new
         end
 
-        def on_leave_field(parent,  node, visitor)
+        def on_leave_field(node, parent, visitor)
           field_defn = visitor.field_definition
           field = "#{visitor.parent_type_definition.name}.#{field_defn.name}"
           @used_fields << field