Using native fetch on supported browsers

package.json

@@ -1,6 +1,6 @@
 {
    "name": "@hibas123/secure-file-wrapper",
-   "version": "2.3.2",
+   "version": "2.3.3",
    "main": "lib/index.js",
    "author": "Fabian Stamm <dev@fabianstamm.de>",
    "license": "MIT",

src/index.ts

@@ -1,5 +1,6 @@
 import { Observable, Lock } from "@hibas123/utils";
-import fetch from "cross-fetch"
+//this references global on node and window in browser
+const fetch = this.fetch ? this.fetch : require("cross-fetch").default;
 
 export interface IFileVersion {
    version: string;