Prepare v6.0.0 release (1st PS 0.15.0-compatible release) (#17)

* 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:
+
+## [v6.0.0](https://github.com/purescript-node/purescript-node-url/releases/tag/v6.0.0) - 2022-04-27
+
 Breaking changes:
 - Update project and deps to PureScript v0.15.0 (#16 by @nwolverson, @JordanMartinez, @sigma-andex)
 

bower.json

@@ -12,9 +12,9 @@
     "url": "https://github.com/purescript-node/purescript-node-url.git"
   },
   "dependencies": {
-    "purescript-nullable": "main"
+    "purescript-nullable": "^6.0.0"
   },
   "devDependencies": {
-    "purescript-assert": "master"
+    "purescript-assert": "^6.0.0"
   }
 }