adding or replacing sort params for provider urls when necessary

lib/provider/kleinanzeigen.js

@@ -21,6 +21,8 @@ function applyBlacklist(o) {
 const config = {
   url: null,
   crawlContainer: '#srchrslt-adtable .ad-listitem ',
+  //sort by date is standard oO
+  sortByDateParam: null,
   crawlFields: {
     id: '.aditem@data-adid | int',
     price: '.aditem-main--middle--price | removeNewline | trim',