FIX[123] Specify json format only when necessary

[ngouy]

Now json format doesn't include fixed code anymore. So I removed it from "getCommandArgs" and use it only when required

tested (on my machine) against rubocop v90 and 92, works on both

Fixes #129

[ndbroadbent]

Thanks @ngouy!! I just upgraded to RuboCop 0.93.1 so this is really helpful!

Until this is merged and released, here are the commands I ran to install the fork locally:

Make sure you uninstall the official RuboCop extension first.

cd ~/code
git clone https://github.com/ngouy/vscode-ruby-rubocop.git
cd vscode-ruby-rubocop
git checkout FIX-129-use-json-format-if-necessary
yarn install
npm install -g vsce
vsce package
code --install-extension ruby-rubocop-*.vsix

See also: https://code.visualstudio.com/api/working-with-extensions/publishing-extension

Now "format on save" is working again!

---

P.S. If anyone doesn't know about this already, I also highly recommend checking out: https://github.com/fohte/rubocop-daemon
This makes my "format on save" work extremely fast, because it keeps a copy of rubocop running in the background.
You should try setting up the bash wrapper script: https://github.com/fohte/rubocop-daemon#more-speed

[jpaas]

Bump. Any reason why this is not getting merged?

[ngouy]

I guess unavailable maintainer ATM?

[misogi]

Thanks for great contributing!