changed browserslist config, improved browser sleep detection

src/config.js

@@ -132,3 +132,10 @@ export const CLICKABLE_URL_SCHEMES = ['http', 'https', 'ftp', 'ftps'];
 
 // Size of the QR code in the app.
 export const QRCODE_SIZE = 128;
+
+// How much time has to pass to consider computer awoken from sleep (80 sec).
+// Chrome throttles ticker events in inactive tabs to once per minute. This
+// value ensures that these once-a-minute events do not trigger a reconnect.
+export const WAKE_UP_TIMEOUT = 80000;
+// Timer interval between checks if computer woke up from sleep (1 sec).
+export const WAKE_UP_TICK = 1000;