Fix Skate release notes format (#769)

Fixed issue with release notes by switching it to HTML from Markdown


Before:
<img width="541" alt="image"
src="https://github.com/slackhq/slack-gradle-plugin/assets/12748234/29375f1f-536d-49c7-96bb-e93a9c9b89de">


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build.gradle.kts

@@ -369,7 +369,7 @@ subprojects {
           pluginId.set(pluginDetails.pluginId)
           version.set(pluginDetails.version)
           pluginDescription.set(pluginDetails.description)
-          changeNotes.set(file("change-notes.md").readText())
+          changeNotes.set(file("change-notes.html").readText())
           sinceBuild.set(pluginDetails.sinceBuild)
           authentication.set(
             // Sip the username and token together to create an appropriate encoded auth header

skate-plugin/README.md

@@ -30,6 +30,6 @@ We're sending analytics for almost all Skate features to track user usage. To se
 3. Make call to `SkateTraceReporter` to send up the traces
 
 ## Releasing
-1. Add `change-notes.md` file under `skate-plugin/` and merge it to `main`
+1. Update `change-notes.html` file under `skate-plugin/` and merge it to `main`
 2. Run `publish-skate` Github Action.
 Behind the scene the action's running`./gradlew :skate-plugin:uploadPluginToArtifactory`

skate-plugin/change-notes.html

@@ -0,0 +1,15 @@
+<![CDATA[
+<h2>0.7.3</h2>
+<ul>
+    <li>
+        Project Generator Improvements:
+        <ul>
+            <li>Fully migrated to Skate, directly accessible via <code>File-New-Slack Subproject</code>.</li>
+            <li>New <code>circuit</code> option added to the UI.</li>
+            <li>Added option to <code>Sync</code> with Studio upon successful project generation.</li>
+        </ul>
+    </li>
+    <li>Code owner file parser now supports the new YAML format.</li>
+    <li>Begin tracking IDE indexing time via tracing.</li>
+</ul>
+]]>