📝 make Changelog template shorter, move symbols to category names

Changelog.md

@@ -3,24 +3,18 @@ All notable changes to this project will be documented in this file
 
 [unreleased]: https://github.com/eugenesvk/xontrib-skim/compare/0.0.5...HEAD
 ## [Unreleased]
-  <!-- - __Added__ -->
-  <!--   + ✨  -->
-  <!--   new features -->
-  <!-- - __Changed__ -->
-  <!--   +   -->
-  <!--   changes in existing functionality -->
-  <!-- - __Fixed__ -->
-  <!--   + 🐞  -->
-  <!--   bug fixes -->
-  <!-- - __Deprecated__ -->
-  <!--   + 💩  -->
-  <!--   soon-to-be removed features -->
-  <!-- - __Removed__ -->
-  <!--   + 🗑️  -->
-  <!--   now removed features -->
-  <!-- - __Security__ -->
-  <!--   + 🔒  -->
-  <!--   vulnerabilities -->
+<!-- - ✨ __Added__ -->
+  <!-- + new features -->
+<!-- - Δ __Changed__ -->
+  <!-- + changes in existing functionality -->
+<!-- - 🐞 __Fixed__ -->
+  <!-- + bug fixes -->
+<!-- - 💩 __Deprecated__ -->
+  <!-- + soon-to-be removed features -->
+<!-- - 🗑️ __Removed__ -->
+  <!-- + now removed features -->
+<!-- - 🔒 __Security__ -->
+  <!-- + vulnerabilities -->
 
 [0.0.5]: https://github.com/eugenesvk/xontrib-skim/releases/tag/0.0.5
 ## [0.0.5]