Fix version number in the changelog

Author: Cito

changelog.html

@@ -13,7 +13,7 @@ <h1 class="title">Changelog for DBUtils</h1>
 
 <section id="section-1">
 <h2>3.0.0</h2>
-<p>DBUtils 2.0.3 was released on November 26, 2021.</p>
+<p>DBUtils 3.0.0 was released on November 26, 2021.</p>
 <p>It is intended to be used with Python versions 3.6 to 3.10.</p>
 <p>Changes:</p>
 <ul class="simple">