Add README.md to lint checks

Because why not?

.markdownlintrc

@@ -3,5 +3,7 @@
   "line-length": false,
   "first-header-h1": false,
   "first-line-h1": false,
-  "no-duplicate-header": false
+  "no-duplicate-header": false,
+  "heading-increment": false,
+  "no-trailing-punctuation": false
 }

README.md

@@ -1,5 +1,4 @@
-auto-changelog
-==============
+# auto-changelog
 
 Command line tool for generating a changelog from git tags and commit history
 
@@ -8,14 +7,12 @@ Command line tool for generating a changelog from git tags and commit history
 [![Greenkeeper](https://img.shields.io/badge/greenkeeper-enabled-brightgreen.svg)](https://greenkeeper.io)
 [![Test Coverage](https://img.shields.io/codecov/c/github/cookpete/auto-changelog.svg)](https://codecov.io/gh/CookPete/auto-changelog)
 
-
 ### Installation
 
 ```bash
 npm install -g auto-changelog
 ```
 
-
 ### Usage
 
 Simply run `auto-changelog` in the root folder of a git repository. `git log` is run behind the scenes in order to parse the commit history.
@@ -265,14 +262,16 @@ If you are upgrading from `0.x`, the same options are still supported out of the
 
 If anything isn’t working correctly, [open an issue](https://github.com/CookPete/auto-changelog/issues).
 
-
 ### FAQ
 
 #### What’s a changelog?
+
 See [keepachangelog.com](http://keepachangelog.com).
 
 #### What does this do?
+
 The command parses your git commit history and generates a changelog based on tagged versions, merged pull requests and closed issues. See a simple example in [this very repo](CHANGELOG.md).
 
 #### Why do I need it?
+
 Because keeping a changelog can be tedious and difficult to get right. If you don’t have the patience for a hand-crafted, bespoke changelog then this makes keeping one rather easy. It also can be [automated if you’re feeling extra lazy](#what-you-might-do-if-youre-clever).

package.json

@@ -7,7 +7,7 @@
   },
   "scripts": {
     "lint": "standard --verbose | snazzy",
-    "lint-markdown": "markdownlint test/data/*.md",
+    "lint-markdown": "markdownlint README.md test/data/*.md",
     "test": "cross-env NODE_ENV=test nyc mocha test",
     "coverage": "nyc report --reporter=json && codecov -f coverage/coverage-final.json",
     "clean": "rm -rf lib coverage",