Release 0.0.2-BETA

Version: 0.0.2-BETA

Added:
  - property child-constraint: [padding, border, ...]
  - position saving (use `positionable` tag)
  - full transparent color: NONE
  - tag label
  - tag h1, h2, h3, h4, h5, h6

Patches:
  - fix slider hitbox

Tweaks:
  - remake home page