Updater loop with period and http route (#240)

* Updater loop with period and http route
* Using DNS over TLS to update servers
* Better logging
* Remove goroutines for cyberghost updater
* Respects context for servers update (quite slow overall)
* Increase shutdown grace period to 5 seconds
* Update announcement
* Add log lines for each provider update start

internal/updater/nordvpn.go

@@ -15,8 +15,10 @@ import (
 
 func (u *updater) updateNordvpn() (err error) {
 	servers, warnings, err := findNordvpnServers(u.httpGet)
-	for _, warning := range warnings {
-		u.println(warning)
+	if u.options.CLI {
+		for _, warning := range warnings {
+			u.logger.Warn("Nordvpn: %s", warning)
+		}
 	}
 	if err != nil {
 		return fmt.Errorf("cannot update Nordvpn servers: %w", err)