fix: correct type problem on rest parameter

The error was:

    .../types/index.d.ts:9:29 - error TS2370: A rest parameter must be of an array type.

    9 type AsyncFunction<A, O> = (...args: A) => Promise<O>;
                                  ~~~~~~~~~~

So enforce the parameter to be some kind of array.

Author: mat813

types/index.d.ts

@@ -6,7 +6,7 @@ import { Timeout, Interval } from 'safe-timers';
 
 export = Bree;
 
-type AsyncFunction<A, O> = (...args: A) => Promise<O>;
+type AsyncFunction<A extends any[], O> = (...args: A) => Promise<O>;
 
 declare class Bree extends EventEmitter {
   config: Bree.BreeConfigs;