Bump version and add changelog

Bump version and add changelog

diff --git a/CHANGELOG b/CHANGELOG
index 51f9380..42c54a6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,11 @@
-- Unrelease
+28-04-2021
+
+- Version 3.3.5
+
+  - PERF: Optimised CORS preflight handling
+  - FEATURE: Enable CORS preflight caching
+  - FEATURE: Removed trailing cache buster from message bus polls
+  - PERF: Improved delay poll timeout for cases where a tab moves in and out of the background
 
 02-10-2020
 
diff --git a/lib/message_bus/version.rb b/lib/message_bus/version.rb
index debdb49..51c28c9 100644
--- a/lib/message_bus/version.rb
+++ b/lib/message_bus/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MessageBus
-  VERSION = "3.3.4"
+  VERSION = "3.3.5"
 end
diff --git a/package.json b/package.json
index 6524b63..f66a777 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "message-bus-client",
-  "version": "3.3.4",
+  "version": "3.3.5",
   "description": "A message bus client in Javascript",
   "main": "assets/message-bus.js",
   "keywords": "es6, modules",

GitHub sha: 50228a2f