Ukuu pops up multiple update notices if left alone for long enough

[kode54]

Describe the bug If update notices are triggered while the machine is locked, the windows continue opening up every two hours until dismissed.

To Reproduce Steps to reproduce the behavior:

1. Lock the desktop.
2. Wait for a kernel update.
3. Unlock the desktop.

Alternate steps to reproduce

1. Wait for a kernel update.
2. Run ukuu --notify repeatedly.

Expected behavior A single update notice is on the screen, notifying of a new kernel update.

Screenshots Can't do this, I just installed the update.

System (please complete the following information):

• Linux Distribution Name and Version: Ubuntu 18.04.1
• Desktop: KDE
• Application Version: v18.9