docs: remove contribution section

Author: hacdias

README.md

@@ -20,20 +20,13 @@ go-path
 ## Table of Contents
 
 - [API](#api)
-- [Contribute](#contribute)
 - [License](#license)
 
 ## TODO
 
 This package could probably be merged into go-ipld, or something along those lines. It
 doesnt really make sense as its own standalone thing.
 
-## Contribute
-
-PRs are welcome!
-
-Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
-
 ## License
 
 MIT © Juan Batiz-Benet