fix: pubsub default config (#393)

* docs: update browser example pubsub

* docs: fix pubsub example config

* fix: make pubsub default to enabled

This allows for only adding the module to have it enabled. Previously you would have to supply and enable the module which is unncessary for users

examples/libp2p-in-the-browser/1/src/browser-bundle.js

@@ -8,6 +8,7 @@ const SPDY = require('libp2p-spdy')
 const SECIO = require('libp2p-secio')
 const Bootstrap = require('libp2p-bootstrap')
 const DHT = require('libp2p-kad-dht')
+const Gossipsub = require('libp2p-gossipsub')
 const libp2p = require('libp2p')
 
 // Find this list at: https://github.com/ipfs/js-ipfs/blob/master/src/core/runtime/config-browser.json
@@ -48,7 +49,8 @@ class Node extends libp2p {
           wsstar.discovery,
           Bootstrap
         ],
-        dht: DHT
+        dht: DHT,
+        pubsub: Gossipsub
       },
       config: {
         peerDiscovery: {
@@ -75,8 +77,8 @@ class Node extends libp2p {
         dht: {
           enabled: false
         },
-        EXPERIMENTAL: {
-          pubsub: false
+        pubsub: {
+          enabled: false
         }
       },
       connectionManager: {