Add 'supports' to the schema
Fix formatting
Extra clarification on supports.
Spec.md: Supports is marked as v1.2
Merge tips48/supports aka commit '41e8e4c'

* commit '41e8e4c':
  Spec.md: Supports is marked as v1.2
  Extra clarification on supports.
  Fix formatting
  Add 'supports' to the schema