Add boolean as acceptable type for Matcher

typings/matches.d.ts

@@ -1,7 +1,7 @@
 import { NativeTestInstance } from './query-helpers';
 
 export type MatcherFunction = (content: string, element: HTMLElement) => boolean;
-export type Matcher = string | RegExp | MatcherFunction;
+export type Matcher = boolean | string | RegExp | MatcherFunction;
 
 export type NormalizerFn = (text: string) => string;
 export type SelectorFn = (element: NativeTestInstance) => boolean;