typo in swagger basepath generate

Author: st3xupery

lib/swagger/index.js

@@ -17,7 +17,7 @@ swagger._getSwaggerBase = () => {
   let basePath, host, protocol
   if (jsonApi._apiConfig.urlPrefixAlias) {
     const urlObj = url.parse(jsonApi._apiConfig.urlPrefixAlias)
-    basePath = basePath.replace(/(?!^\/)\/$/, '')
+    basePath = urlObj.pathname.replace(/(?!^\/)\/$/, '')
     host = urlObj.host
     protocol = urlObj.protocol.replace(/:$/, '')
   } else {