fixed error when unmarshalling directive locations in introspection r…

…esponse

introspection.go

@@ -193,6 +193,8 @@ func IntrospectAPI(queryer Queryer) (*ast.Schema, error) {
 			return nil, err
 		}
 
+		fmt.Println(directive.Locations)
+
 		// save the directive definition to the schema
 		schema.Directives[directive.Name] = &ast.DirectiveDefinition{
 			Name:        directive.Name,
@@ -336,7 +338,7 @@ type IntrospectionQuerySchema struct {
 type IntrospectionQueryDirective struct {
 	Name        string                    `json:"name"`
 	Description string                    `json:"description"`
-	Locations   []string                  `json:"location"`
+	Locations   []string                  `json:"locations"`
 	Args        []IntrospectionInputValue `json:"arg"`
 }