Add auto fixer for jsx-self-close-rule

[QuentinBouygues]

Hi,

This PR adds an auto fixer for the jsxSelfClose rule, along with a test and readme update.

As we throw an error when there are no node children, the fix just keeps the opening element and makes him self-closing

I'll keep an eye on the PR if changes are needed ! 😄

[QuentinBouygues]

Hi again, just coming back for an update, is there anything missing in the PR ?

[adidahiya]

let's include a space right before the / here, to match what prettier would do with formatting

[QuentinBouygues]

Thanks for the review, I added the space for all the self-closing tags. Is it ok ?

[adidahiya]

thanks @QuentinBouygues! in the future, please avoid force-pushing and use additional commits instead (we squash at the end of a PR)