Update completions json

[DeeDeeG]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

Update completions.json.

I did so by running (effectively): npm install -g coffeescript && npx coffee update.coffee.

This adds the following completions:

• text-justify
• justify-self
• justify-items

Alternate Designs

I considered trying to source some descriptions from somewhere for these three new properties, and manually entering them into completions.json. I have not done so yet. but it could probably be done pretty easily.

Benefits

Provides completions for more CSS properties.

Possible Drawbacks

Not a downside to this change really, but a note: I noticed that the upstream source of data removed all the descriptions. I though this was a shame, so I preserved the existing descriptions. I had to add these new changes carefully.

I chose to do git add -p completions.json and skipped all of the changes other than adding these new properties to the list. I had to manually edit some diff hunks in order to make them apply without removing existing descriptions.

There may be a less tedious or repetitive way to do this, but it worked for me.

So a word of advice: Be careful when updating completions.json in the future. As mentioned above, I think it would be a shame to delete all the descriptions.

Applicable Issues