[REQUEST] bashtop should fail gracefully if the Bash version is lower than 4.4

[Calinou]

Is your feature request related to a problem? Please describe.

Yes. I tried bashtop on an Ubuntu 16.04 machine, which only has Bash 4.3. bashtop crashed a few seconds after starting, without displaying any error message. (It works fine on my other Fedora 31 machine, which has Bash 5.x.)

Describe the solution you'd like

bashtop should check the bash version and exit with a non-zero error code if the Bash version on the system is lower than 4.4.

I could look at implementing this if this feature is desired.

Describe alternatives you've considered

N/A

Additional context

N/A

[aristocratos]

This would be a good idea and a easy fix. I can take a look at it tonight. But feel free to make a pull request if you want to.