Breaking: replace remark-changelog with remark-common-changelog

Drops support of `Unreleased` section. Linting will now emit an
error if such a section is encountered in a `CHANGELOG.md`.

Ref #81
Ref #82
Ref vweevers/remark-changelog#12

README.md

@@ -43,7 +43,7 @@
 This module saves you time in three ways:
 
 - **No configuration.** The easiest way to enforce markdown code quality in your project. No decisions to make. No `remark` plugins to manage.
-- **Automatically format markdown.** Run `hallmark fix` to format markdown, wrap GitHub issues and usernames in links, autocomplete a `CHANGELOG.md` following [Keep A Changelog](https://keepachangelog.com/en/1.0.0/), and more.
+- **Automatically format markdown.** Run `hallmark fix` to format markdown, wrap GitHub issues and usernames in links, autocomplete a `CHANGELOG.md` following [Common Changelog](https://common-changelog.org) and more.
 - **Catch style issues & mistakes early.** Save code review time by eliminating back-and-forth between reviewer & contributor.
 
 ## Quick Start
@@ -214,7 +214,7 @@ While `hallmark lint` will warn about unlinked references.
 
 ### `changelog`
 
-An object containing options to be passed to [`remark-changelog`](https://github.com/vweevers/remark-changelog):
+An object containing options to be passed to [`remark-common-changelog`](https://github.com/vweevers/remark-common-changelog):
 
 - `submodules` (boolean): enable experimental git submodule support. Will (upon encountering new or empty changelog entries) collect commits from submodules and list them in the changelog as `<submodule>: <message>`.
 

index.js

@@ -75,7 +75,7 @@ function hallmark (options, callback) {
             }]
           : null,
 
-        [require('remark-changelog'), { cwd, fix, pkg, repository, ...changelog }],
+        [require('remark-common-changelog'), { cwd, fix, pkg, repository, ...changelog }],
         [require('remark-github'), { repository }],
 
         // Does nothing unless configured

package.json

@@ -25,8 +25,8 @@
     "github-url-from-git": "^1.5.0",
     "remark": "^12.0.1",
     "remark-autolink-references": "^1.0.0",
-    "remark-changelog": "^1.2.1",
     "remark-collapse": "~0.1.2",
+    "remark-common-changelog": "^0.0.2",
     "remark-git-contributors": "^3.0.0",
     "remark-github": "^9.0.1",
     "remark-lint": "^7.0.1",