update typings

Author: donavon

typings/index.d.ts

@@ -40,6 +40,11 @@ export function render<Q extends Queries>(
   options: RenderOptions<Q>,
 ): RenderResult<Q>
 
+/**
+ * Renders a test component that calls back to the test.
+ */
+export function testHook(callback: () => void): void
+
 /**
  * Unmounts React trees that were mounted with render.
  */