Prepare v4.0.0 release (1st PS 0.15.0-compatible release) (#27)

* Update the bower dependencies

* Update the changelog

Author: JordanMartinez

CHANGELOG.md

@@ -4,6 +4,16 @@ Notable changes to this project are documented in this file. The format is based
 
 ## [Unreleased]
 
+Breaking changes:
+
+New features:
+
+Bugfixes:
+
+Other improvements:
+
+## [v4.0.0](https://github.com/purescript-web/purescript-web-events/releases/tag/v4.0.0) - 2022-04-27
+
 Breaking changes:
 - Migrate FFI to ES modules (#24 by @JordanMartinez)
 

bower.json

@@ -15,9 +15,9 @@
     "package.json"
   ],
   "dependencies": {
-    "purescript-datetime": "master",
-    "purescript-enums": "master",
-    "purescript-nullable": "main",
-    "purescript-foreign": "master"
+    "purescript-datetime": "^6.0.0",
+    "purescript-enums": "^6.0.0",
+    "purescript-nullable": "^6.0.0",
+    "purescript-foreign": "^7.0.0"
   }
 }