Update README.md

Remove references to `electron-packager`

Author: Ariandr

README.md

@@ -101,14 +101,11 @@ Steps:
 2) Install `node` on your computer (https://nodejs.org/en/)
 3) Run `npm install` in the root of downloaded/cloned project
 4) Verify that the app can be launched with the command `npm start` (optional)
-5) Build the project to generate installable files (2 options):
+5) Build the project to generate installable files:
 
 - For building with `electron-builder` you need to run `npm run dist`. Generated files end up in the folder `dist` in the root of your project.
-- For building with `electron-packager` you need to run `npm run release`. Generated files end up in the folder `PushNotifications-darwin-x64` in the root of your project (macOS only).
 
-To build for Windows & Linux you need to use `electron-builder`. Also, this way is preferable because it creates installable files.
-
-`electron-builder` will generate:
+As a result `electron-builder` will generate:
 - For macOS: `.zip`, `.dmg` (if you build using macOS)
 - For Windows: `.msi` (if you build using Windows)
 - For Linux: `.deb`, `.AppImage` (if you build using Linux)