1.5.4

Fix some possible deadlock and race condition.

1.5.3

Minor fixes.

1.5.2

Fix possible segmentation fault.
Improve some messages.

1.5.1

Fix possible deadlock.

1.5.0

Add bruteforcing speed and last tried password to progress info.
Add option to print progress info regularly.
Add option to restore/save state from/to a file.