docs: update short version

Author: mrholek

package.json

@@ -3,7 +3,7 @@
   "description": "The most popular front-end framework for developing responsive, mobile-first projects on the web rewritten by the CoreUI Team",
   "version": "5.9.0",
   "config": {
-    "version_short": "5.8"
+    "version_short": "5.9"
   },
   "keywords": [
     "css",