Refactor readme.md

Author: wooorm

readme.md

@@ -1,20 +1,19 @@
-# mdast-util-to-string [![Build Status](https://img.shields.io/travis/wooorm/mdast-mdast-util-to-string.svg)](https://travis-ci.org/wooorm/mdast-mdast-util-to-string) [![Coverage Status](https://img.shields.io/codecov/c/github/wooorm/mdast-mdast-util-to-string.svg)](https://codecov.io/github/wooorm/mdast-mdast-util-to-string)
+# mdast-util-to-string [![Build Status][travis-badge]][travis] [![Coverage Status][coverage-badge]][coverage]
 
-[**remark**](https://github.com/wooorm/remark) utility to get the plain text
-content of an [**mdast**](https://github.com/wooorm/mdast) node.
+[**remark**][remark] utility to get the plain text
+content of an [**mdast**][mdast] node.
 
 ## Installation
 
-[npm](https://docs.npmjs.com/cli/install):
+[npm][npm-install]:
 
 ```bash
 npm install mdast-util-to-string
 ```
 
-**mdast-util-to-string** is also available for
-[duo](http://duojs.org/#getting-started), and as an AMD, CommonJS, and globals
-module, [uncompressed and
-compressed](https://github.com/wooorm/mdast-util-to-string/releases).
+**mdast-util-to-string** is also available for [duo][],
+and as an AMD, CommonJS, and globals module,
+[uncompressed and compressed][releases].
 
 ## Usage
 
@@ -38,23 +37,49 @@ toString(ast);
 
 ## API
 
-### toString(node)
+### `toString(node)`
 
 Get the text content of a node.
 
-The algorithm checks the value of `node`, then its `alt`, and then
-its `title`, in that order. If no value is found, the algorithm checks
-the children of `node` and joins them (without spaces or newlines).
+The algorithm checks `value` of `node`, then `alt`, and finally `title`.
+If no value is found, the algorithm checks the children of `node` and
+joins them (without spaces or newlines).
 
 > This is not a markdown to plain-text library.
 > Use [strip-markdown](https://github.com/wooorm/strip-markdown) for that.
 
-Parameters:
+**Parameters**:
 
-*   `node` (`Node`) — [**mdast** node](https://github.com/wooorm/mdast#node);
+*   `node` ([`Node`][mdast-node]).
 
-Returns: `string` — text representation of `node`.
+**Returns**: `string` — text representation of `node`.
 
 ## License
 
-[MIT](LICENSE) © [Titus Wormer](http://wooorm.com)
+[MIT][license] © [Titus Wormer][home]
+
+<!-- Definitions -->
+
+[travis-badge]: https://img.shields.io/travis/wooorm/mdast-util-to-string.svg
+
+[travis]: https://travis-ci.org/wooorm/mdast-util-to-string
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/mdast-util-to-string.svg
+
+[coverage]: https://codecov.io/github/wooorm/mdast-util-to-string
+
+[remark]: https://github.com/wooorm/remark
+
+[mdast]: https://github.com/wooorm/mdast
+
+[mdast-node]: https://github.com/wooorm/mdast#node
+
+[npm-install]: https://docs.npmjs.com/cli/install
+
+[duo]: http://duojs.org/#getting-started
+
+[releases]: https://github.com/wooorm/mdast-util-to-string/releases
+
+[license]: LICENSE
+
+[home]: http://wooorm.com