Remove reference to distribution files

Author: wooorm

readme.md

@@ -10,9 +10,6 @@ Check if a [node][] is a [**heading**][spec] [element][].
 npm install hast-util-heading
 ```
 
-**hast-util-heading** is also available as an AMD, CommonJS, and
-globals module, [uncompressed and compressed][releases].
-
 ## Usage
 
 ```javascript
@@ -56,8 +53,6 @@ Check if the given value is a [**heading**][spec] [element][].
 
 [npm]: https://docs.npmjs.com/cli/install
 
-[releases]: https://github.com/wooorm/hast-util-heading/releases
-
 [license]: LICENSE
 
 [author]: http://wooorm.com