Provide autocompletion in bash and zsh

[josacar]

Closes #116

[josacar]

I'm quite a newbie in Golang, pls gimme some feedback :)

[nickatsegment]

I love this! Had been meaning to add this myself, but never got around to it. Will review today.

[nickatsegment]

I wonder if instead of subcommands, we could do a parameter defaulting to auto (the current shell).

• bash -c 'aws-okta completion' --> bash
• bash -c aws-okta completion bash'` --> bash
• zsh -c 'aws-okta completion' --> zsh

Seems a little bit nicer, but not at all a blocker.

[josacar]

I don't know how you can check this, any suggestion?

[nickatsegment]

I was thinking of just parsing $SHELL. I think that's pretty standard.

[josacar]

$SHELL doesn't work if you change between shells, only for login shell. Maybe we can iterate it in another pr

[nickatsegment]

If you want to figure out the auto thing, go ahead. Otherwise, feel free to merge!

[josacar]

@nickatsegment I don't have write access so I cannot merge :) Feel free to do it if you feel so.

Thanks for maintaining this project