Corrected changelog

Author: linkdotnet

CHANGELOG.md

@@ -6,12 +6,12 @@ All notable changes to **ValueStringBuilder** will be documented in this file. T
 
 ## [Unreleased]
 
-## [1.8.0] - 2022-11-15
-
 ### Changed
 
 - Slight improvement when appending nullable types to the string builder
 
+## [1.8.0] - 2022-11-15
+
 ### Added
 
 -   implicit cast operator from `string` and `ReadOnlySpan<char>` to the `ValueStringBuilder` with pre-initialized buffer