remove trailing commas if they exist from selectedText

[cheazy]

{
    "standard.semistandard": true, 
    "ruby.lint": {
        "rubocop": true
    },
}

was turning into

{
    "ruby.lint": {
        rubocop: true
    },
    "standard.semistandard": true
}

this fixes that, but I don't think this is the best approach (using regex on a JSON).

for example: this will get mangled:

{
    "foo": ", }" 
}

[richie5um]

Thanks. I'll have a think before merging this, as I'm not entirely convinced that the regex idea is the right one.

Thanks for taking the time to do the work and submit a PR though. :-)

[richie5um]

Hi. Thank you very much for your PR. I decided to fix it a slightly different way - now published as v1.11.0. Please can you let me know if this doesn't do what you'd hoped for. I also included your menu commands - which I've not used or tested. Hope this is all ok. Thanks again!

[cheazy]

Thanks! Works for me.

The menu buttons should work exactly like they do in the command palette and only show up when right clicking inside of JSON and JSON with Comments files.