finalize is not a promise - fixed

Docs state @return void: https://github.com/archiverjs/node-archiver/blob/0bc4872daf94055ba3fafd958d6769711fa39652/lib/core.js#L131

types/archiver/index.d.ts

@@ -35,7 +35,7 @@ declare namespace archiver {
         directory(dirpath: string, destpath: false | string, data?: EntryData | EntryDataFunction): this;
         file(filename: string, data: EntryData): this;
         glob(pattern: string, options?: glob.IOptions, data?: EntryData): this;
-        finalize(): Promise<void>;
+        finalize(): void;
 
         setFormat(format: string): this;
         setModule(module: Function): this;