fix: Types incorrectly marked as non-optional

Author: rschristian

src/index.d.ts

@@ -17,6 +17,6 @@ type Options = {
 export default function register(
     Component: AnyComponent,
     tagName: string,
-    propNames: string[],
-    options: Options,
+    propNames?: string[],
+    options?: Options,
 ): void;