fix: update Electron mirror to artifacts.electronjs.org (#26)

Author: robinchrist

src/urlRegistry.ts

@@ -5,7 +5,7 @@ import os from 'os';
 
 const NODE_MIRROR = process.env.NVM_NODEJS_ORG_MIRROR || "https://nodejs.org/dist";
 const IOJS_MIRROR = process.env.NVM_IOJS_ORG_MIRROR || "https://iojs.org/dist";
-const ELECTRON_MIRROR = process.env.ELECTRON_MIRROR || "https://atom.io/download/atom-shell";
+const ELECTRON_MIRROR = process.env.ELECTRON_MIRROR || "https://artifacts.electronjs.org/headers/dist";
 
 export const HOME_DIRECTORY = process.env[(os.platform() === "win32") ? "USERPROFILE" : "HOME"] as string;