message: Use std::thread and detach for login (lib)
diff: #include "Poco/Util/TimerTaskAdapter.h"
  #include <mutex> // NOLINT
  #include <thread>
  -#include <future>
  namespace toggl {
  @@ -2175,11 +2174,10 @@ error Context::attemptOfflineLogin(const std::string email,
  error Context::asyncLogin(const std::string email,
  const std::string password) {
  - std::future<error> resultFromDB = std::async([&](std::string email, std::string password) {
  + std::thread backgroundThread([&](std::string email, std::string password) {
  return this->Login(email, password);
  }, email, password);
  -
  - //error result = resultFromDB.get();
  + backgroundThread.detach();
  return noError;
  }
  