Prepare v9.0.0 release (1st PS 0.15.0-compatible release) (#35)

* 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:
+
+## [v9.0.0](https://github.com/purescript-node/purescript-node-process/releases/tag/v9.0.0) - 2022-04-27
+
 Breaking changes:
 - Update project and deps to PureScript v0.15.0 (#34 by @nwolverson, @JordanMartinez, @sigma-andex)
 

bower.json

@@ -12,12 +12,12 @@
     "output"
   ],
   "dependencies": {
-    "purescript-effect": "master",
-    "purescript-foreign-object": "master",
-    "purescript-maybe": "master",
-    "purescript-node-streams": "master",
-    "purescript-posix-types": "master",
-    "purescript-prelude": "master",
-    "purescript-unsafe-coerce": "master"
+    "purescript-effect": "^4.0.0",
+    "purescript-foreign-object": "^4.0.0",
+    "purescript-maybe": "^6.0.0",
+    "purescript-node-streams": "^6.0.0",
+    "purescript-posix-types": "^6.0.0",
+    "purescript-prelude": "^6.0.0",
+    "purescript-unsafe-coerce": "^6.0.0"
   }
 }