Prepare release

Author: sebastianbergmann

ChangeLog.md

@@ -2,7 +2,7 @@
 
 All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
-## [9.0.0] - 2020-MM-DD
+## [9.0.0] - 2020-08-07
 
 ### Added
 

composer.json

@@ -27,7 +27,6 @@
         "sort-packages": true
     },
     "prefer-stable": true,
-    "minimum-stability": "dev",
     "require": {
         "php": "^7.3 || ^8.0",
         "ext-dom": "*",

src/Version.php

@@ -22,7 +22,7 @@ final class Version
     public static function id(): string
     {
         if (self::$version === null) {
-            self::$version = (new VersionId('9.0', dirname(__DIR__)))->getVersion();
+            self::$version = (new VersionId('9.0.0', dirname(__DIR__)))->getVersion();
         }
 
         return self::$version;