chore: prepare release keeps newline in changelog

The Update-Changelog function of the ChangelogManagement module removes
newlines at the end of CHANGELOG.md. A workaround is in place to always
add back a newline.

The objective is to avoid unnecessary diffs during changelog updates.

Prepare-Release.ps1

@@ -5,12 +5,22 @@ param (
     $version
 )
 
+$ErrorActionPreference = "Stop"
+
+# Requires: Install-Module -Name ChangelogManagement
 Update-Changelog -ReleaseVersion $version -LinkMode Automatic -LinkPattern @{
     FirstRelease = "https://github.com/rcdailey/trash-updater/releases/tag/v{CUR}"
     NormalRelease = "https://github.com/rcdailey/trash-updater/compare/v{PREV}...v{CUR}"
     Unreleased = "https://github.com/rcdailey/trash-updater/compare/v{CUR}...HEAD"
 }
 
+# Read & Write the file after updating the changelog to force a newline at the end of the file. The
+# Update-Changelog method removes the newline at the end.
+$content = Get-Content -Path .\CHANGELOG.md
+Set-Content -Path .\CHANGELOG.md -Value $content
+
+# Requires: dotnet tool install -g nbgv
 nbgv set-version $version
+
 git commit -m "release: v$version" -- CHANGELOG.md version.json
 git tag -m "release v$version" "v$version"