Setup Differential Updates

[aashutoshrathi]

Checking for update
Found version 0.4.4 (url: <repo>-Setup-0.4.4.exe)
Downloading update from <repo>-Setup-0.4.4.exe
updater cache dir: C:\Users\<uname>\AppData\Local\<repo>-updater
Download block maps (old: "https://api.github.com/repos/<owner>/<repo>/releases/assets/x.blockmap", new: https://api.github.com/repos/<owner>/<repo>/releases/assets/x.blockmap)
Cannot download differentially, fallback to full download: Error: Maximum allowed size is 50 MB
    at Object.responseHandler (C:\Users\aashu\AppData\Local\Programs\<repo>\resources\app.asar\node_modules\builder-util-runtime\out\httpExecutor.js:241:26)
    at ClientRequest.<anonymous> (C:\Users\aashu\AppData\Local\Programs\<repo>\resources\app.asar\node_modules\builder-util-runtime\out\httpExecutor.js:303:17)
    at ClientRequest.emit (events.js:223:5)
    at SimpleURLLoaderWrapper.<anonymous> (electron/js2c/browser_init.js:93:6152)
    at SimpleURLLoaderWrapper.emit (events.js:223:5)

Ref: electron-userland/electron-builder#4676