fix interface ShareMetadata (yorkie#527)

* fix interface ShareMetadata

Author: jhaidi

index.d.ts

@@ -32,6 +32,7 @@ declare module "react-native-wechat" {
       | "audio"
       | "file";
     thumbImage?: string;
+    title?: string;
     description?: string;
     webpageUrl?: string;
     imageUrl?: string;