Feature: Editing an existing task

[igor-simoes]

First of all, I would like to thank you for this great tool.

I notice that it is not possible to edit an existing task, this PR adds this feature. Currently, this feature only supports inline editing.

$ pls

ID     TASK     STATUS                                                            
━━━━━━━━━━━━━━━━━━
1    task 1            ○ 
2    task 2            ○ 

$ pls edit 2 'edited'

Are you sure you want to edit Task #2? [y/N]: y

ID     TASK     STATUS                                                            
━━━━━━━━━━━━━━━━━━
1    task 1            ○ 
2    edited            ○ 

[guedesfelipe]

Thank you so much for developing this amazing feature! 😃

Could you pull the main branch so that the tests pass correctly please?