Fix exports

Signed-off-by: Valentin Popov <info@valentineus.link>

dist/index.d.ts

@@ -1,5 +1,17 @@
+import { ActivityManager } from "./activity-manager";
+import { Message } from "./message";
+import { Method } from "./method";
 import { Service } from "./service";
+import { Subscription } from "./subscription";
 
 declare module "webos-service" {
-	export = Service;
+	export default Service;
 }
+
+export {
+	ActivityManager,
+	Message,
+	Method,
+	Service,
+	Subscription,
+};