refactor - Githubissues

These PR changes everything :bat:

Based on the concepts of unified, I define a unist like ast for chan I called it: chast

This is the structure:

interface Root <: Node {
  children: [Preface, Release*]
}

interface Preface <: Node {
  children: [Node]
}

interface Release <: Node {
  identifier: string,
  version: string,
  url: string?
  yanked: boolean?
  unreleased: boolean?
  children: [Action]
}

interface Action <: Node {
  name: string
  children: [Change*, Group*]
}

interface Group <: Node {
  name: string,
  children: [Change]
}

interface Change <: Node {
  children: [Node]
}

Packages:

remark-chan: Parser to transform a mdast tree to a chast tree (like: https://github.com/remarkjs/remark-rehype)
chan-stringify: Compiles a chast tree into a markdown keepachangelog compatible. (like: https://github.com/remarkjs/remark/tree/master/packages/remark-stringify)
chan-core: Provides an API and transforms to work with the chast tree.
- initialize
- addChanges
- addRelease
- getLastReleaseVersion
chast: Provides constructors, sanitizers and validators for each chast node.
chan: It's the cli as always.
git-compare-url: Return compare urls for the most popular git providers.

Other things:

TODO (Help is welcome)

geut / chan