Update theme version

Author: ktquez

package.json

@@ -31,6 +31,6 @@
     "vuepress": "^0.14.2"
   },
   "dependencies": {
-    "vuepress-theme-ktquez": "^0.2.6"
+    "vuepress-theme-ktquez": "^0.2.8"
   }
 }