chore: release version v0.4.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "libp2p-floodsub",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "libp2p-floodsub, also known as pubsub-flood or just dumbsub, this implementation of pubsub focused on delivering an API for Publish/Subscribe, but with no CastTree Forming (it just floods the network).",
   "main": "src/index.js",
   "scripts": {