feat(remark): migrate from markdownlint to remark-lint (#326)

BREAKING CHANGE: `markdownlint` is unsupported no longer. It may fail linting your Markdown files.

---

See also:

- https://github.com/remarkjs/remark-lint
- https://github.com/remarkjs/remark-lint/blob/master/doc/comparison-to-markdownlint.md
- https://github.com/DavidAnson/markdownlint

.commitlintrc.js

@@ -18,7 +18,7 @@ module.exports = {
         "release",
         "init",
         "api",
-        "markdownlint",
+        "remark",
         "travis",
         "prettier",
         "standard-version",

.remarkignore

@@ -0,0 +1 @@
+CHANGELOG.md

lib/init.js

@@ -82,7 +82,7 @@ module.exports = async function init({
   const cmd = initCommand(cwd, logger);
   await cmd.updatePackageFile();
   await cmd.writePackageFile(".editorconfig");
-  await cmd.writePackageFile(".markdownlint.json");
+  await cmd.writePackageFile(".remarkignore");
 };
 
 module.exports.desc = `Setup npm project: