fix(skill-author): document plugin version bump in README

## Why
README "What it does" didn't reflect the plugin version bump step added
to both create and improve flows.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/plugin.json

@@ -13,5 +13,5 @@
   "skills": [
     "skills/"
   ],
-  "version": "1.0.3"
+  "version": "1.0.4"
 }