Fix erroneous orderBy parsing

src/index.js

@@ -205,7 +205,7 @@ module.exports = {
 					}
 	
 					if (orderBy != null) {
-						let ascending = orderBy.startsWith("-");
+						let ascending = !orderBy.startsWith("-");
 						
 						let orderField = (ascending === true)
 							? orderBy