fix: update duration plugin type file (#1065)

Axnyff · web-flow · commit 94af9af27c5b · 2020-09-21T21:22:13.000+08:00
diff --git a/types/plugin/duration.d.ts b/types/plugin/duration.d.ts
@@ -11,7 +11,7 @@ export declare class Duration {
 
   clone(): Duration
   
-  humanize(withSuffix: boolean): string
+  humanize(withSuffix?: boolean): string
 
   milliseconds(): number
   asMilliseconds(): number
