Created the settings.json with Sublime Text version 3999 marking

the head commit today as the last supported version of Sublime
Text 3. This is used to start developing the migration for Sublime
Text 4. New updates to Sublime Text 3 should no happen. If required, a tag 3998 should be created inside settings.json with
the changes required for this new version.

Fixed packagecontrol.io not interpreting the markdown lists

continuations.

Fixed packagecontrol.io not interpreting the markdown lists

continuations.

Fixed markdown list not rendering on packagecontorl.io engine

Make the README.md instructions clear

Merge pull request #1 from victorporof/master

Update from upstream repo victorporof/Sublime-HTMLPrettify@master