Fix attribute name interpolation

1. extend `meta.interpolation` to include leading and trailing
   punctuation to comply with ST's scope naming guidelines.
2. fix closing `]` scope.
3. adjust/add tests

Remove Github Actions

Syntax test runner fails due to missing embedded syntax packages.

This is an issue for another PR.

Update README.md

Make installation notes clearer.

BUG #183: Correct template-tag regex

Remove the first_line_match from .sublime-syntax (#191)

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Update scope to match new LESS extension

Revert "source.scss -> source.css.scss"

This reverts commit 016f552.

source.scss -> source.css.scss

Merge pull request #143 from Thom1729/fix-macros

Moved macros to src.

Release 3.3.0

- Updated to support new stable Sublime 3.1 (Build 3170)
- New syntax file with macros, and updated HTML base syntax (Thanks @Thom1729)
- Fixed issue with LESS highlighting (Thanks @braver)