Update formatting in changelog (#380)

CHANGELOG.md

@@ -3,14 +3,14 @@
 Documentation for rocDecode is available at
 [https://rocm.docs.amd.com/projects/rocDecode/en/latest/](https://rocm.docs.amd.com/projects/rocDecode/en/latest/)
 
-## rocDecode 0.6.0 (Unreleased)
+## rocDecode 0.6.0
 
-## Additions
+### Additions
 
 * FFMPEG V5.X Support
 * Mariner - Build Support
 
-## Optimizations
+### Optimizations
 
 * Setup Script - Error Check install
 
@@ -85,4 +85,4 @@ Documentation for rocDecode is available at
   * amdgpu-core - `1:5.6.50601-1649308`
 * FFMPEG - `4.2.7` / `4.4.2-0`
 * libva-dev - `2.7.0-2` / `2.14.0-1`
-* rocDecode Setup Script - `V1.1`
+* rocDecode Setup Script - `V1.1`