print message with timestamp

sometimes I want to check when did I run the command without typing the command. 

This is current stdout message.
As-is
```sh
❯ pmdr q -b 5
Notification (id: 67) created and queued
```

Let's add timestamp like this.
To-be
```sh
❯ pmdr q -b 5
[2023-01-22 14:12] Notification (id: 67) created and queued
```
