docs: remove duplicate readme section (#80)

Removes duplicate contribution section

README.md

@@ -12,7 +12,6 @@
 - [Install](#install)
 - [Usage](#usage)
   - [Running the tests](#running-the-tests)
-- [Contribute](#contribute)
 - [License](#license)
 - [Contribution](#contribution)
 
@@ -64,14 +63,6 @@ main().catch(err => {
 
 For an example, see the js-libp2p interop test runner.
 
-## Contribute
-
-Feel free to join in. All welcome. Open an [issue](https://github.com/ipfs/ipfs-interop/issues)!
-
-This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
-
-[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
-
 ## License
 
 Licensed under either of