Added typescript support

index.d.ts

@@ -0,0 +1,7 @@
+declare class JWT {
+    sign(payload: object, secret: string, algorithm?: "HS256" | "HS512"): Promise<string>
+    verify(token: string, secret: string, algorithm?: "HS256" | "HS512"): Promise<boolean>
+    decode(token: string): object | null
+}
+declare const _exports: JWT
+export = _exports