fix(TS): update Typings (#331)

Extend the typings of Query interface to match those from dom-testing-library.

Author: pschyma

typings/index.d.ts

@@ -3,7 +3,13 @@ import {queries, BoundFunction} from 'dom-testing-library'
 export * from 'dom-testing-library'
 
 interface Query extends Function {
-  (container: HTMLElement, ...args: any[]): HTMLElement[] | HTMLElement | null
+  (container: HTMLElement, ...args: any[]):
+    | Error
+    | Promise<HTMLElement[]>
+    | Promise<HTMLElement>
+    | HTMLElement[]
+    | HTMLElement
+    | null
 }
 
 interface Queries {