Fix ConfigOptions.zone type

wong2 · wong2 · commit 55cc95c0d499 · 2018-06-08T16:05:32.000+08:00
diff --git a/index.d.ts b/index.d.ts
@@ -128,7 +128,7 @@ export declare namespace conf {
         /**
          * @default null
          */
-        zone?: 'huadong' | 'huabei' | 'huanan' | 'beimei';
+        zone?: Zone,
 
         /**
          * @default -1
