Updated Topbar with a select option if urls is passed.

Can use `?name=NAME` to preselect.

src/core/index.js

@@ -6,7 +6,7 @@ import ApisPreset from "core/presets/apis"
 import * as AllPlugins from "core/plugins/all"
 import { parseSeach, filterConfigs } from "core/utils"
 
-const CONFIGS = [ "url", "spec", "validatorUrl", "onComplete", "onFailure", "authorizations", "docExpansion",
+const CONFIGS = [ "url", "urls", "spec", "validatorUrl", "onComplete", "onFailure", "authorizations", "docExpansion",
     "apisSorter", "operationsSorter", "supportedSubmitMethods", "dom_id", "defaultModelRendering", "oauth2RedirectUrl",
     "showRequestHeaders", "custom", "modelPropertyMacro", "parameterMacro", "displayOperationId" ]
 
@@ -23,6 +23,7 @@ module.exports = function SwaggerUI(opts) {
     dom_id: null,
     spec: {},
     url: "",
+    urls: null,
     layout: "BaseLayout",
     docExpansion: "list",
     validatorUrl: "https://online.swagger.io/validator",