message: Add the (hopefully final) sync server URLs (lib)
diff: @@ -39,9 +39,9 @@ std::string API() {
  std::string SyncAPI() {
  if (use_staging_as_backend) {
  - // TODO
  + return "https://sync.toggl.space/";
  }
  - return "http://localhost:8080";
  + return "https://sync.toggl.com/";
  }
  std::string TimelineUpload() {
  